Re: [Texascavers] [BexarGrotto] NSS Webinar Talk tonight (Wednesday) February 17. Dr. Alexander

2016-02-17 Thread Logan McNatt via Texascavers 

On 2/17/2016 11:37 AM, Diana Tomchick via Texascavers wrote:
One wonders if the lack of plate tectonic activity on Mars is a limiting 
factor for finding life on the planet at this time. Diana


Yes Diana,
I have spent numerous sleepless nights wondering about that.
The more we learn, the more difficult the questions become.
Ah, for the age of Innocence, when the primary question was "Why is Mars 
red?"

;-)
Lowgun
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Re: [Texascavers] [BexarGrotto] NSS Webinar Talk tonight (Wednesday) February 17. Dr. Alexander

2016-02-17 Thread Diana Tomchick via Texascavers 
See reviews of David Whitehouse’s book here (no, these are not reviews by Arne 
Saknussemm or Jules Verne).

http://www.nature.com/nature/journal/v528/n7580/pdf/528035a.pdf

http://www.publishersweekly.com/978-1-60598-959-4

https://www.kirkusreviews.com/book-reviews/david-whitehouse/into-the-heart-of-our-world/

One wonders if the lack of plate tectonic activity on Mars is a limiting factor 
for finding life on the planet at this time.

Diana

**
Diana R. Tomchick
Professor
Departments of Biophysics and Biochemistry
University of Texas Southwestern Medical Center
5323 Harry Hines Blvd.
Rm. ND10.214A
Dallas, TX 75390-8816
diana.tomch...@utsouthwestern.edu
(214) 645-6383 (phone)
(214) 645-6353 (fax)

> On Feb 17, 2016, at 9:09 AM, Ron Ralph via Texascavers 
>  wrote:
>
> Earth lovers,
>
> I just read “Into the Heart of Our World  --  A Journey to the Center of the 
> Earth: A Remarkable Voyage of Scientific Discovery” by David Whitehouse and 
> recommend it if you want to see earth first.  It was highly recommended by 
> Arne Saknussemm and Jules Verne.  The cover and back have great cave photos.
>
> Ron
>
> From: Geary Schindel
> Sent: Wednesday, February 17, 2016 7:34 AM
> To: mailto:texascavers@texascavers.com ; bexargro...@googlegroups.com
> Subject: [BexarGrotto] NSS Webinar Talk tonight (Wednesday) February 17. Dr. 
> Alexander
>
> Folks,
>
> This talk is about looking at extreme environments on earth (The bottom of 
> the Soudan Mine) and using them to compare to current conditions on Mars. Dr. 
> Calvin Alexander has some wonderful pictures of the Martian landscape from 
> some of the high resolution Martian probes that clearly show caves, 
> sinkholes, paleo sinking streams, rimstone dams, and paleo and possible 
> existing springs. If there is life on Mars, it will probably be subsurface 
> and possibly associated with caves and groundwater.
>
> This should prove to be a popular presentation.
>
> Register and get there early.
>
> Thanks,
>
> Geary Schindel
>
>
> "The Soudan Mine Hydrobiogeology: A Martian Analog?" (similarity)  Rimstone 
> dams found on Mars
>
> Join us for a webinar on Feb 17, 2016 at 8:00 PM CST, (Which is 9PM EST / 7PM 
> MST / 6PM PST. Please check your time zone for the correct start time.
>
> Register now!
> https://attendee.gotowebinar.com/register/6013464760054344705
>
> Speaker: Dr. Calvin Alexander, Professor Emeritus Earth Sciences Department 
> University of Minnesota.
>
> The Soudan Iron Mine in northeastern Minnesota mined high grade hematite from 
> the late 1800s until about 1960 in 2.7 billion year old rocks. When the mine 
> ceased operations it was given to the State of Minnesota and continues 
> operations as State Historic Park offering mine tours to visitors.
>
> The mine has a calcium, sodium, magnesium chloride brine about twice as salty 
> as sea water that seeps into its lowest level. The brine is anoxic (oxygen 
> free) and has high concentrations of ferrous iron. These anoxic, waters are 
> actively depositing a wide variety of classic cave formations: flow stones, 
> stalagmites, soda straw stalactites and rimstone dams. These formations are 
> made of the iron oxides ferrihydrite and goethite and contain the mineral 
> jarosite – and are spectacularly colored.
>
> Photographs of Mars surface features apparently produced by liquid water, 
> have increased in number, resolution and credibility. The “gullies” 
> discovered on Mars by the high resolution MOS orbiter camera have been 
> confirmed by the higher resolution HiRISE orbiter images and are now known to 
> occur widely on Mars. In several locations on Mars the MOS and HiRISE images 
> reveal structures that appear to be rimstone dams associated with the distal 
> ends of gullies.
>
> The presence of iron oxide rimstone dams growing from the brines in the 
> Soudan Mine suggest that those brines may be an analog for conditions on some 
> parts of Mars. It is interesting to note that in the Soudan Mine brines form 
> a productive environment for several microbiological communities.
> Please arrive at least 10 minutes to make sure you have a seat at this 
> webinar.
>
> This and all prior webinars are recorded and stored on the NSS website, 
> www.caves.org for future viewing.
>
> The opinions expressed in this webinar are not necessarily those of the NSS.
> After registering, you will receive a confirmation email containing 
> information about joining the webinar.
> View System Requirements
>
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Re: [Texascavers] [BexarGrotto] NSS Webinar Talk tonight (Wednesday) February 17. Dr. Alexander

2016-02-17 Thread Ron Ralph via Texascavers 
Earth lovers,

I just read “Into the Heart of Our World  --  A Journey to the Center of the 
Earth: A Remarkable Voyage of Scientific Discovery” by David Whitehouse and 
recommend it if you want to see earth first.  It was highly recommended by Arne 
Saknussemm and Jules Verne.  The cover and back have great cave photos.

Ron

From: Geary Schindel 
Sent: Wednesday, February 17, 2016 7:34 AM
To: mailto:texascavers@texascavers.com ; bexargro...@googlegroups.com 
Subject: [BexarGrotto] NSS Webinar Talk tonight (Wednesday) February 17. Dr. 
Alexander

Folks,

 

This talk is about looking at extreme environments on earth (The bottom of the 
Soudan Mine) and using them to compare to current conditions on Mars. Dr. 
Calvin Alexander has some wonderful pictures of the Martian landscape from some 
of the high resolution Martian probes that clearly show caves, sinkholes, paleo 
sinking streams, rimstone dams, and paleo and possible existing springs. If 
there is life on Mars, it will probably be subsurface and possibly associated 
with caves and groundwater.

 

This should prove to be a popular presentation. 

 

Register and get there early.

 

Thanks,

 

Geary Schindel

 

 

"The Soudan Mine Hydrobiogeology: A Martian Analog?" (similarity)  Rimstone 
dams found on Mars 

 

Join us for a webinar on Feb 17, 2016 at 8:00 PM CST, (Which is 9PM EST / 7PM 
MST / 6PM PST. Please check your time zone for the correct start time.  
  

 

Register now! 

https://attendee.gotowebinar.com/register/6013464760054344705 

 

Speaker: Dr. Calvin Alexander, Professor Emeritus Earth Sciences Department 
University of Minnesota. 

The Soudan Iron Mine in northeastern Minnesota mined high grade hematite from 
the late 1800s until about 1960 in 2.7 billion year old rocks. When the mine 
ceased operations it was given to the State of Minnesota and continues 
operations as State Historic Park offering mine tours to visitors. 

The mine has a calcium, sodium, magnesium chloride brine about twice as salty 
as sea water that seeps into its lowest level. The brine is anoxic (oxygen 
free) and has high concentrations of ferrous iron. These anoxic, waters are 
actively depositing a wide variety of classic cave formations: flow stones, 
stalagmites, soda straw stalactites and rimstone dams. These formations are 
made of the iron oxides ferrihydrite and goethite and contain the mineral 
jarosite – and are spectacularly colored. 

Photographs of Mars surface features apparently produced by liquid water, have 
increased in number, resolution and credibility. The “gullies” discovered on 
Mars by the high resolution MOS orbiter camera have been confirmed by the 
higher resolution HiRISE orbiter images and are now known to occur widely on 
Mars. In several locations on Mars the MOS and HiRISE images reveal structures 
that appear to be rimstone dams associated with the distal ends of gullies. 

The presence of iron oxide rimstone dams growing from the brines in the Soudan 
Mine suggest that those brines may be an analog for conditions on some parts of 
Mars. It is interesting to note that in the Soudan Mine brines form a 
productive environment for several microbiological communities.

Please arrive at least 10 minutes to make sure you have a seat at this webinar.

This and all prior webinars are recorded and stored on the NSS website, 
www.caves.org for future viewing. 


The opinions expressed in this webinar are not necessarily those of the NSS. 

After registering, you will receive a confirmation email containing information 
about joining the webinar.

View System Requirements 



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