PM03- 1/4 PRELIMINARY MAGNETOSTRATIGRAPHY AND ROCK MAGNETIC ANALYSIS OF THE VACA MUERTA FORMATION (UPPER JURASSIC-LOWER CRETACEOUS) IN THE PUERTA CURACO SECTION, ARGENTINA

DIEGO ALEJANDRO KIETZMANN; MELISA KOHAN MARTÍNEZ; TOMÁS LUPPO; MARIA PAULA IGLESIA LLANOS

Querétaro

Congreso; Latinmag 2017; 2017

UNAM Juriquilla

A systematic paleomagnetic study was carried out in the Vaca Muerta Formation, a carbonate- ramp systemcropping out in the Neuquén basin, west-central Argentina. The Vaca Muerta Formation is one of the mostimportant unconventional hydrocarbon reservoirs in the world and its exhaustive study has become a relevanttarget in Argentina. In the Puerta Curaco section, this unit is c. 360 m ? thick bearing ammonites that indicateUpper Jurassic ? Lower Cretaceous ages. Here, paleomagnetic sites were sampled from which nearly 500specimens were collected and processed. The primary origin of the magnetization was proved throughpaleomagnetic field tests. As a result, a preliminary magnetostratigraphic scale was constructed dated withammonites of the Andean Realm, and then correlated to the most recent International Geomagnetic PolarityTime Scale. The resultant magnetostratigraphic scale proved to be consistent with other studies, and allowedthe refinement of the temporal framework of the lower part of the Vaca Muerta Formation. Simultaneously,in order to determine the main magnetic carriers of the magnetic remanence several rock magnetism studieswere carried out such as isothermal remanent magnetization (IRM) acquisition curves, thermomagneticcurves and K vs. field curves that were complemented with observations of magnetic minerals under reflectedlight and scanning electron microscopy.