Field Research in Bolivia and Argentina, June-July 2001

This project is a collaboration between Dr. Brian Horton (UCLA) and Dr. James Reynolds (Brevard College) to determine the uplift history of the Andes from magnetostratigraphic dating of foreland basin strata in Bolivia and northern Argentina. The  project is funded by a National Science Foundation grant to Horton. 

Fieldwork for the active project began in the summer of 2000 when Horton and his graduate student, Brian Hampton, collected preliminary magnetostratigraphy samples from the base of the Chuquichambi section. Reynolds and Hampton analyzed these samples at the Paleomagnetic Laboratory at the University of Pittsburgh in May 2001. Horton, Reynolds, graduate student Richard Fink, and field assistant Matthew Bourke returned to Chuquichambi in July 2001 and collected approximately 1000 new samples in hope of determining the paleomagnetic history of the basal 8 km of strata exposed in the section. The section is exposed on the east limb of the Corque Syncline. The strata are believed to have been deposited between late Eocene and early Miocene time. They appear to represent a long period of continuous sedimentation and foreland basement development. The syncline is situated on the Altiplano at an elevation of > 4,000 m at the latitude of the Andean oroclinal bend. The structure exhibits a “mini-orocline” on both its eastern and western flanks. It is likely that the results of this project will also date the formation of oroclinal bending in this part of the Andes.

Paleomagnetic sample collection also took place in the Cianzo Syncline of Jujuy Province, northwestern Argentina where Reynolds and Horton are collaborating with Dr. Jonas Kley (Jenna University, Germany). This section is more than 4,000 m thick and is believed to have been deposited in late Oligocene-early Miocene time. These strata are exposed between 3,700-4,000 m in the Eastern Cordillera. This will be the first section studied using these techniques in this part of the Andes. Approximately 275 samples were collected from these strata but time limitations precluded sampling the entire section. 

Clicking in any of the boxes of the calendar below will take to the journal entry. Most days also include some photos.


 
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
6/28
Sylva, NC to
La Paz, Bolivia
6/29
La Paz
Chuquichambi
7/1
Chuquichambi
7/2
Chuquichambi
7/3
Chuquichambi
7/4
Chuquichambi
7/5
Chuquichambi
7/6
Chuquichambi to Oruro
7/7
Oruro to Chuquichambi
7/8
Chuquichambi
7/9
Chuquichambi to Belén
7/10
Belén
7/11
Belén
7/12
Belén to 
La Paz
7/13
La Paz
7/14
La Paz to Turco
7/15
Turco to Potosí
7/16
Potosí to Salta, Argentina
7/17
Salta to Angastaco
7/18
Angastaco
7/19
Angastaco
7/20
Angastaco to Salta
7/21
Salta to Humahuaca
7/22
Cianzo Section
7/23
Humahuaca to Palca de Aparzo
7/24
Palca de Aparzo
7/25
Palca de Aparzo
7/26
Palca de Aparzo
7/27
Palca de Aparzo to Humahuaca
7/28
Humahuaca to Potosí, Bolivia
7/29
Potosí to
La Paz
7/30
La Paz
7/31
La Paz to Webster, NC