Mt. Garcia. El cerro de Garcia
Mt. Garcia. El cerro de Garcia
When did it last erupt??
sm1mex- Share Holder
- Posts : 1084
Join date : 2012-06-27
Re: Mt. Garcia. El cerro de Garcia
Probably several million years ago.
Janice Edith- Junior Member
- Posts : 22
Join date : 2016-11-23
Re: Mt. Garcia. El cerro de Garcia
Wonder where I could research it. Google no help.
sm1mex- Share Holder
- Posts : 1084
Join date : 2012-06-27
Re: Mt. Garcia. El cerro de Garcia
sm1mex wrote:Wonder where I could research it. Google no help.
Try contacting the Department of Volcanology, Institute of Geofisics, UNAM Cd de Mexico.
They probably have a lot of info and/or, could direct you to research material.
Any geology studies program at any Universidad in Mexico might have research sources of info.
slainte39- Share Holder
- Posts : 9244
Join date : 2010-07-22
RickS likes this post
Re: Mt. Garcia. El cerro de Garcia
I highly recommend reviewing this website: https://geo-mexico.com/ and the locally written book: https://www.amazon.com/Geo-Mexico-geography-dynamics-modern-Mexico/dp/0973519134 Tony Burton is a treasure of an author and a scholar.
ferret, tonyburton, RickS and Heem like this post
Re: Mt. Garcia. El cerro de Garcia
Thomas Hellyer - Thanks for such kind words; they are very much appreciated.
There is no evidence, to my knowledge, that Mt. García has erupted in post-Conquest times. On the other hand, it still has a well-defined crater, so my best guess would be that it last erupted sometime in the past million years, but not in the past 600! When I get chance, I'll reread some of the geological papers I have stashed away somewhere and report back if I find anything that narrows down or refutes that very broad time frame. The fault system that created the graben/rift valley that the lake occupies is believed to date back about 12 million years.
There is no evidence, to my knowledge, that Mt. García has erupted in post-Conquest times. On the other hand, it still has a well-defined crater, so my best guess would be that it last erupted sometime in the past million years, but not in the past 600! When I get chance, I'll reread some of the geological papers I have stashed away somewhere and report back if I find anything that narrows down or refutes that very broad time frame. The fault system that created the graben/rift valley that the lake occupies is believed to date back about 12 million years.
tonyburton- Junior Member
- Posts : 23
Join date : 2012-05-30
CanuckBob, ferret, Canmex 87, mattoleriver, thomashellyer and Lucky Girl like this post
Re: Mt. Garcia. El cerro de Garcia
Below is a link to a research paper from 1995 that discusses the dating of volcanic rock samples collected from 42 sites surrounding the Chapala Region. The paper states:
"The reversed polarity of Cerro García Formation was assigned to the Matuyama Chron (a period of time ranging from about 1 to 2-1/2 million years ago) based on the geomorphology of the volcano and in accordance with a K-Ar age of 1.7 Ma (1.7 million years)."
Perhaps someone with a knowledge of geology could have a look and tell us what this means in terms of when Cerro García may have last erupted.
= = = = = = = = = =
Southwestward volcanic migration in the western Trans-Mexican Volcanic Belt during the last 2 Ma
Hugo Delgado Granados, et al.
Geofísica Internacional, January 1995
bit.ly 33sDN59
"The reversed polarity of Cerro García Formation was assigned to the Matuyama Chron (a period of time ranging from about 1 to 2-1/2 million years ago) based on the geomorphology of the volcano and in accordance with a K-Ar age of 1.7 Ma (1.7 million years)."
Perhaps someone with a knowledge of geology could have a look and tell us what this means in terms of when Cerro García may have last erupted.
= = = = = = = = = =
Southwestward volcanic migration in the western Trans-Mexican Volcanic Belt during the last 2 Ma
Hugo Delgado Granados, et al.
Geofísica Internacional, January 1995
bit.ly 33sDN59
cerebrozo- Share Holder
- Posts : 85
Join date : 2017-06-18
ferret and tonyburton like this post
Re: Mt. Garcia. El cerro de Garcia
cerebrozo, Thanks! That is one of the articles I was going to look for. The article suggests that my 1 million guesstimate is the lower end of the age range for Cerro García as a volcano. As you realize, that does not, however, necessarily indicate when the volcano last erupted. My background is actually in geomorphology. Cerro García still has a relatively well-defined crater, which time will eventually obliterate. By comparing it to volcanoes elsewhere in Mexico, where the chronology is much better established, I would guess that Cerro García has not erupted in the last 100,000 years or so. If I find out more when I have chance to dig out other relevant papers, I'll report back.
tonyburton- Junior Member
- Posts : 23
Join date : 2012-05-30
ferret likes this post
Re: Mt. Garcia. El cerro de Garcia
Janice Edith wrote:Probably several million years ago.
As cerebrozo said, 1 to 2 1/2 million years is probably the time frame. I don´t think the OP is going to get an actual year for whatever research they are doing.
slainte39- Share Holder
- Posts : 9244
Join date : 2010-07-22
Page 1 of 1
Permissions in this forum:
You cannot reply to topics in this forum
|
|