Salar Grande

Wednesday, Nov. 26, 2008:

Today we went to Salar Grande and explored the northern portion of our field area: took bedding attitudes, mapped contacts and fault planes, investigated various volcanic flows and fault scarps. We found that there is a portion of limestone that is truncated by a fault on its western side, consequently surrounding it in intermediate to mafic volcanics. To the south of this limestone lense we found two different types of volcanics: lava, which is more vesicular, and pyroclastic flows, with clasts ranging from a few centimeters to 10 centimeters. We then headed to the fault scarp which is hypothesized to have cut of the source of the spherules observed in the field area. Overall, a very windy day and a good introduction!