INVESTIGADORES
POIRE Daniel Gustavo
congresos y reuniones científicas
Título:
Chemostratigraphy of the Mina Verdún Group and other cement-grade Proterozoic limestone deposits in Uruguay
Autor/es:
GAUCHER, CLAUDIO; SIAL, ALCIDES; POIRÉ, DANIEL; CERNUSCHI, FEDERICO; FERREIRA, V.P; GHIGLINO, LETICIA; GOZÁLEZ, PABLO; MARTINEZ, GABRIELA; PIMMENTEL, M.M.
Lugar:
Uruguay
Reunión:
Simposio; Southamerican Symposio of Isotope Geology; 2007
Institución organizadora:
Sociedad Uruguaya de Geología
Resumen:
The Mina Verdún Group (MVG) was erected by
Poiré et al. (2003) to include a sedimentary succession
exposed in the homonymous mine, which is made up
(from base to top) of (Fig. 2):
-Don Mario Formation: metapelites
-La Toma Formation: marls
-El Calabozo Formation: grey stromatolitic limestones
-Gibraltar Formation: dolomitic marls, red limestones and
massive dolostones
Thickness of the succession at its stratotype reaches 285
m. An important feature of the thick (up to 170 m)
limestones of El Calabozo Formation is the occurrence of
a stromatolite assemblage composed almost exclusively
by Conophyton (Fig. 2). These limestones are of
considerable economic importance, because they
constitute the basis of a large cement industry. A
minimum age for the succession is provided by the
unconformably overlying Las Ventanas Formation, which
on the basis of acritarch biostratigraphy is assigned to the
lower Ediacaran (635-575 Ma, Blanco & Gaucher, 2005).
Gaucher et al. (2004d) assign the succession exposed in
the Burgue o limestone Quarry, 40 km to the south of
Mina Verdún, to the MVG. The succession exposed in
the quarry, 150 m in thickness, includes (from base to
top): metamarls, limestones, stromatolitic Conophytonlimestones
and massive dolostones. At the stratotype and
in Burgueño Quarry, conglomerates overly with erosional
unconformity the MVG. These conglomerates, assigned
to LVFm (Blanco & Gaucher, 2004, 2005), include a
level of diamictites and breccias at the contact to the
MVG, which has been recognized as a palaeokarst
surface. The assocation of palaeokarst surfaces developed
on top of carbonate successions and overlain by
glacigenic diamictites is well known for a number of
Neoproterozoic successions. Dropstones occur in
laminated mudstones, associated with diamictites.
However, no carbonates occur on top of the diamictites.
We carried out 13C and 18O analyses of carbonates and
corresponding petrographic studies at two sections of the
MVG and also on carbonates mined for the cement
industry at La Plata Mine (ANCAP), with the aim of
testing chemostratigraphic tools as an aid for the
exporation of cement-grade carbonates.
corresponding petrographic studies at two sections of the
MVG and also on carbonates mined for the cement
industry at La Plata Mine (ANCAP), with the aim of
testing chemostratigraphic tools as an aid for the
exporation of cement-grade carbonates.
and massive dolostones. At the stratotype and
in Burgueño Quarry, conglomerates overly with erosional
unconformity the MVG. These conglomerates, assigned
to LVFm (Blanco & Gaucher, 2004, 2005), include a
level of diamictites and breccias at the contact to the
MVG, which has been recognized as a palaeokarst
surface. The assocation of palaeokarst surfaces developed
on top of carbonate successions and overlain by
glacigenic diamictites is well known for a number of
Neoproterozoic successions. Dropstones occur in
laminated mudstones, associated with diamictites.
However, no carbonates occur on top of the diamictites.
We carried out 13C and 18O analyses of carbonates and
corresponding petrographic studies at two sections of the
MVG and also on carbonates mined for the cement
industry at La Plata Mine (ANCAP), with the aim of
testing chemostratigraphic tools as an aid for the
exporation of cement-grade carbonates.
corresponding petrographic studies at two sections of the
MVG and also on carbonates mined for the cement
industry at La Plata Mine (ANCAP), with the aim of
testing chemostratigraphic tools as an aid for the
exporation of cement-grade carbonates.
Mina Verdún, to the MVG. The succession exposed in
the quarry, 150 m in thickness, includes (from base to
top): metamarls, limestones, stromatolitic Conophytonlimestones
and massive dolostones. At the stratotype and
in Burgueño Quarry, conglomerates overly with erosional
unconformity the MVG. These conglomerates, assigned
to LVFm (Blanco & Gaucher, 2004, 2005), include a
level of diamictites and breccias at the contact to the
MVG, which has been recognized as a palaeokarst
surface. The assocation of palaeokarst surfaces developed
on top of carbonate successions and overlain by
glacigenic diamictites is well known for a number of
Neoproterozoic successions. Dropstones occur in
laminated mudstones, associated with diamictites.
However, no carbonates occur on top of the diamictites.
We carried out 13C and 18O analyses of carbonates and
corresponding petrographic studies at two sections of the
MVG and also on carbonates mined for the cement
industry at La Plata Mine (ANCAP), with the aim of
testing chemostratigraphic tools as an aid for the
exporation of cement-grade carbonates.
corresponding petrographic studies at two sections of the
MVG and also on carbonates mined for the cement
industry at La Plata Mine (ANCAP), with the aim of
testing chemostratigraphic tools as an aid for the
exporation of cement-grade carbonates.
and massive dolostones. At the stratotype and
in Burgueño Quarry, conglomerates overly with erosional
unconformity the MVG. These conglomerates, assigned
to LVFm (Blanco & Gaucher, 2004, 2005), include a
level of diamictites and breccias at the contact to the
MVG, which has been recognized as a palaeokarst
surface. The assocation of palaeokarst surfaces developed
on top of carbonate successions and overlain by
glacigenic diamictites is well known for a number of
Neoproterozoic successions. Dropstones occur in
laminated mudstones, associated with diamictites.
However, no carbonates occur on top of the diamictites.
We carried out 13C and 18O analyses of carbonates and
corresponding petrographic studies at two sections of the
MVG and also on carbonates mined for the cement
industry at La Plata Mine (ANCAP), with the aim of
testing chemostratigraphic tools as an aid for the
exporation of cement-grade carbonates.
corresponding petrographic studies at two sections of the
MVG and also on carbonates mined for the cement
industry at La Plata Mine (ANCAP), with the aim of
testing chemostratigraphic tools as an aid for the
exporation of cement-grade carbonates.
considerable economic importance, because they
constitute the basis of a large cement industry. A
minimum age for the succession is provided by the
unconformably overlying Las Ventanas Formation, which
on the basis of acritarch biostratigraphy is assigned to the
lower Ediacaran (635-575 Ma, Blanco & Gaucher, 2005).
Gaucher et al. (2004d) assign the succession exposed in
the Burgue o limestone Quarry, 40 km to the south of
Mina Verdún, to the MVG. The succession exposed in
the quarry, 150 m in thickness, includes (from base to
top): metamarls, limestones, stromatolitic Conophytonlimestones
and massive dolostones. At the stratotype and
in Burgueño Quarry, conglomerates overly with erosional
unconformity the MVG. These conglomerates, assigned
to LVFm (Blanco & Gaucher, 2004, 2005), include a
level of diamictites and breccias at the contact to the
MVG, which has been recognized as a palaeokarst
surface. The assocation of palaeokarst surfaces developed
on top of carbonate successions and overlain by
glacigenic diamictites is well known for a number of
Neoproterozoic successions. Dropstones occur in
laminated mudstones, associated with diamictites.
However, no carbonates occur on top of the diamictites.
We carried out 13C and 18O analyses of carbonates and
corresponding petrographic studies at two sections of the
MVG and also on carbonates mined for the cement
industry at La Plata Mine (ANCAP), with the aim of
testing chemostratigraphic tools as an aid for the
exporation of cement-grade carbonates.
corresponding petrographic studies at two sections of the
MVG and also on carbonates mined for the cement
industry at La Plata Mine (ANCAP), with the aim of
testing chemostratigraphic tools as an aid for the
exporation of cement-grade carbonates.
and massive dolostones. At the stratotype and
in Burgueño Quarry, conglomerates overly with erosional
unconformity the MVG. These conglomerates, assigned
to LVFm (Blanco & Gaucher, 2004, 2005), include a
level of diamictites and breccias at the contact to the
MVG, which has been recognized as a palaeokarst
surface. The assocation of palaeokarst surfaces developed
on top of carbonate successions and overlain by
glacigenic diamictites is well known for a number of
Neoproterozoic successions. Dropstones occur in
laminated mudstones, associated with diamictites.
However, no carbonates occur on top of the diamictites.
We carried out 13C and 18O analyses of carbonates and
corresponding petrographic studies at two sections of the
MVG and also on carbonates mined for the cement
industry at La Plata Mine (ANCAP), with the aim of
testing chemostratigraphic tools as an aid for the
exporation of cement-grade carbonates.
corresponding petrographic studies at two sections of the
MVG and also on carbonates mined for the cement
industry at La Plata Mine (ANCAP), with the aim of
testing chemostratigraphic tools as an aid for the
exporation of cement-grade carbonates.
Mina Verdún, to the MVG. The succession exposed in
the quarry, 150 m in thickness, includes (from base to
top): metamarls, limestones, stromatolitic Conophytonlimestones
and massive dolostones. At the stratotype and
in Burgueño Quarry, conglomerates overly with erosional
unconformity the MVG. These conglomerates, assigned
to LVFm (Blanco & Gaucher, 2004, 2005), include a
level of diamictites and breccias at the contact to the
MVG, which has been recognized as a palaeokarst
surface. The assocation of palaeokarst surfaces developed
on top of carbonate successions and overlain by
glacigenic diamictites is well known for a number of
Neoproterozoic successions. Dropstones occur in
laminated mudstones, associated with diamictites.
However, no carbonates occur on top of the diamictites.
We carried out 13C and 18O analyses of carbonates and
corresponding petrographic studies at two sections of the
MVG and also on carbonates mined for the cement
industry at La Plata Mine (ANCAP), with the aim of
testing chemostratigraphic tools as an aid for the
exporation of cement-grade carbonates.
corresponding petrographic studies at two sections of the
MVG and also on carbonates mined for the cement
industry at La Plata Mine (ANCAP), with the aim of
testing chemostratigraphic tools as an aid for the
exporation of cement-grade carbonates.
and massive dolostones. At the stratotype and
in Burgueño Quarry, conglomerates overly with erosional
unconformity the MVG. These conglomerates, assigned
to LVFm (Blanco & Gaucher, 2004, 2005), include a
level of diamictites and breccias at the contact to the
MVG, which has been recognized as a palaeokarst
surface. The assocation of palaeokarst surfaces developed
on top of carbonate successions and overlain by
glacigenic diamictites is well known for a number of
Neoproterozoic successions. Dropstones occur in
laminated mudstones, associated with diamictites.
However, no carbonates occur on top of the diamictites.
We carried out 13C and 18O analyses of carbonates and
corresponding petrographic studies at two sections of the
MVG and also on carbonates mined for the cement
industry at La Plata Mine (ANCAP), with the aim of
testing chemostratigraphic tools as an aid for the
exporation of cement-grade carbonates.
corresponding petrographic studies at two sections of the
MVG and also on carbonates mined for the cement
industry at La Plata Mine (ANCAP), with the aim of
testing chemostratigraphic tools as an aid for the
exporation of cement-grade carbonates.
Conophyton (Fig. 2). These limestones are of
considerable economic importance, because they
constitute the basis of a large cement industry. A
minimum age for the succession is provided by the
unconformably overlying Las Ventanas Formation, which
on the basis of acritarch biostratigraphy is assigned to the
lower Ediacaran (635-575 Ma, Blanco & Gaucher, 2005).
Gaucher et al. (2004d) assign the succession exposed in
the Burgue o limestone Quarry, 40 km to the south of
Mina Verdún, to the MVG. The succession exposed in
the quarry, 150 m in thickness, includes (from base to
top): metamarls, limestones, stromatolitic Conophytonlimestones
and massive dolostones. At the stratotype and
in Burgueño Quarry, conglomerates overly with erosional
unconformity the MVG. These conglomerates, assigned
to LVFm (Blanco & Gaucher, 2004, 2005), include a
level of diamictites and breccias at the contact to the
MVG, which has been recognized as a palaeokarst
surface. The assocation of palaeokarst surfaces developed
on top of carbonate successions and overlain by
glacigenic diamictites is well known for a number of
Neoproterozoic successions. Dropstones occur in
laminated mudstones, associated with diamictites.
However, no carbonates occur on top of the diamictites.
We carried out 13C and 18O analyses of carbonates and
corresponding petrographic studies at two sections of the
MVG and also on carbonates mined for the cement
industry at La Plata Mine (ANCAP), with the aim of
testing chemostratigraphic tools as an aid for the
exporation of cement-grade carbonates.
corresponding petrographic studies at two sections of the
MVG and also on carbonates mined for the cement
industry at La Plata Mine (ANCAP), with the aim of
testing chemostratigraphic tools as an aid for the
exporation of cement-grade carbonates.
and massive dolostones. At the stratotype and
in Burgueño Quarry, conglomerates overly with erosional
unconformity the MVG. These conglomerates, assigned
to LVFm (Blanco & Gaucher, 2004, 2005), include a
level of diamictites and breccias at the contact to the
MVG, which has been recognized as a palaeokarst
surface. The assocation of palaeokarst surfaces developed
on top of carbonate successions and overlain by
glacigenic diamictites is well known for a number of
Neoproterozoic successions. Dropstones occur in
laminated mudstones, associated with diamictites.
However, no carbonates occur on top of the diamictites.
We carried out 13C and 18O analyses of carbonates and
corresponding petrographic studies at two sections of the
MVG and also on carbonates mined for the cement
industry at La Plata Mine (ANCAP), with the aim of
testing chemostratigraphic tools as an aid for the
exporation of cement-grade carbonates.
corresponding petrographic studies at two sections of the
MVG and also on carbonates mined for the cement
industry at La Plata Mine (ANCAP), with the aim of
testing chemostratigraphic tools as an aid for the
exporation of cement-grade carbonates.
Mina Verdún, to the MVG. The succession exposed in
the quarry, 150 m in thickness, includes (from base to
top): metamarls, limestones, stromatolitic Conophytonlimestones
and massive dolostones. At the stratotype and
in Burgueño Quarry, conglomerates overly with erosional
unconformity the MVG. These conglomerates, assigned
to LVFm (Blanco & Gaucher, 2004, 2005), include a
level of diamictites and breccias at the contact to the
MVG, which has been recognized as a palaeokarst
surface. The assocation of palaeokarst surfaces developed
on top of carbonate successions and overlain by
glacigenic diamictites is well known for a number of
Neoproterozoic successions. Dropstones occur in
laminated mudstones, associated with diamictites.
However, no carbonates occur on top of the diamictites.
We carried out 13C and 18O analyses of carbonates and
corresponding petrographic studies at two sections of the
MVG and also on carbonates mined for the cement
industry at La Plata Mine (ANCAP), with the aim of
testing chemostratigraphic tools as an aid for the
exporation of cement-grade carbonates.
corresponding petrographic studies at two sections of the
MVG and also on carbonates mined for the cement
industry at La Plata Mine (ANCAP), with the aim of
testing chemostratigraphic tools as an aid for the
exporation of cement-grade carbonates.
and massive dolostones. At the stratotype and
in Burgueño Quarry, conglomerates overly with erosional
unconformity the MVG. These conglomerates, assigned
to LVFm (Blanco & Gaucher, 2004, 2005), include a
level of diamictites and breccias at the contact to the
MVG, which has been recognized as a palaeokarst
surface. The assocation of palaeokarst surfaces developed
on top of carbonate successions and overlain by
glacigenic diamictites is well known for a number of
Neoproterozoic successions. Dropstones occur in
laminated mudstones, associated with diamictites.
However, no carbonates occur on top of the diamictites.
We carried out 13C and 18O analyses of carbonates and
corresponding petrographic studies at two sections of the
MVG and also on carbonates mined for the cement
industry at La Plata Mine (ANCAP), with the aim of
testing chemostratigraphic tools as an aid for the
exporation of cement-grade carbonates.
corresponding petrographic studies at two sections of the
MVG and also on carbonates mined for the cement
industry at La Plata Mine (ANCAP), with the aim of
testing chemostratigraphic tools as an aid for the
exporation of cement-grade carbonates.
o limestone Quarry, 40 km to the south of
Mina Verdún, to the MVG. The succession exposed in
the quarry, 150 m in thickness, includes (from base to
top): metamarls, limestones, stromatolitic Conophytonlimestones
and massive dolostones. At the stratotype and
in Burgueño Quarry, conglomerates overly with erosional
unconformity the MVG. These conglomerates, assigned
to LVFm (Blanco & Gaucher, 2004, 2005), include a
level of diamictites and breccias at the contact to the
MVG, which has been recognized as a palaeokarst
surface. The assocation of palaeokarst surfaces developed
on top of carbonate successions and overlain by
glacigenic diamictites is well known for a number of
Neoproterozoic successions. Dropstones occur in
laminated mudstones, associated with diamictites.
However, no carbonates occur on top of the diamictites.
We carried out 13C and 18O analyses of carbonates and
corresponding petrographic studies at two sections of the
MVG and also on carbonates mined for the cement
industry at La Plata Mine (ANCAP), with the aim of
testing chemostratigraphic tools as an aid for the
exporation of cement-grade carbonates.
corresponding petrographic studies at two sections of the
MVG and also on carbonates mined for the cement
industry at La Plata Mine (ANCAP), with the aim of
testing chemostratigraphic tools as an aid for the
exporation of cement-grade carbonates.
and massive dolostones. At the stratotype and
in Burgueño Quarry, conglomerates overly with erosional
unconformity the MVG. These conglomerates, assigned
to LVFm (Blanco & Gaucher, 2004, 2005), include a
level of diamictites and breccias at the contact to the
MVG, which has been recognized as a palaeokarst
surface. The assocation of palaeokarst surfaces developed
on top of carbonate successions and overlain by
glacigenic diamictites is well known for a number of
Neoproterozoic successions. Dropstones occur in
laminated mudstones, associated with diamictites.
However, no carbonates occur on top of the diamictites.
We carried out 13C and 18O analyses of carbonates and
corresponding petrographic studies at two sections of the
MVG and also on carbonates mined for the cement
industry at La Plata Mine (ANCAP), with the aim of
testing chemostratigraphic tools as an aid for the
exporation of cement-grade carbonates.
corresponding petrographic studies at two sections of the
MVG and also on carbonates mined for the cement
industry at La Plata Mine (ANCAP), with the aim of
testing chemostratigraphic tools as an aid for the
exporation of cement-grade carbonates.
Conophytonlimestones
and massive dolostones. At the stratotype and
in Burgueño Quarry, conglomerates overly with erosional
unconformity the MVG. These conglomerates, assigned
to LVFm (Blanco & Gaucher, 2004, 2005), include a
level of diamictites and breccias at the contact to the
MVG, which has been recognized as a palaeokarst
surface. The assocation of palaeokarst surfaces developed
on top of carbonate successions and overlain by
glacigenic diamictites is well known for a number of
Neoproterozoic successions. Dropstones occur in
laminated mudstones, associated with diamictites.
However, no carbonates occur on top of the diamictites.
We carried out 13C and 18O analyses of carbonates and
corresponding petrographic studies at two sections of the
MVG and also on carbonates mined for the cement
industry at La Plata Mine (ANCAP), with the aim of
testing chemostratigraphic tools as an aid for the
exporation of cement-grade carbonates.
corresponding petrographic studies at two sections of the
MVG and also on carbonates mined for the cement
industry at La Plata Mine (ANCAP), with the aim of
testing chemostratigraphic tools as an aid for the
exporation of cement-grade carbonates.
13C and 18O analyses of carbonates and
corresponding petrographic studies at two sections of the
MVG and also on carbonates mined for the cement
industry at La Plata Mine (ANCAP), with the aim of
testing chemostratigraphic tools as an aid for the
exporation of cement-grade carbonates.