$0.00
Abstract
12-4 Keith, Stanley B., Johnston, Paul A., and Johnston, Kimberley J., 2017, A serpentinite “smoking gun” in the Burgess Shale; evidence for deep-sourced magnesium-charged hydrothermal brines and mud volcanism that fueled the Burgess biosystem: Abstracts With Programs Geological Society of America, v. 49, no. 6, Abstract No. 30-5.
Abstract
12-4 Keith, Stanley B., Johnston, Paul A., and Johnston, Kimberley J., 2017, A serpentinite “smoking gun” in the Burgess Shale; evidence for deep-sourced magnesium-charged hydrothermal brines and mud volcanism that fueled the Burgess biosystem: Abstracts With Programs Geological Society of America, v. 49, no. 6, Abstract No. 30-5.
ABS
Re-examination of a clinochlore (Mg-chlorite)/dolomite-dominated breccia, collected in 2009 at the Fossil Gully Fault upslope from the Mt Stephen Trilobite Beds, revealed a population of exotic clasts that resembled serpentinite. The serpentinite has now been confirmed by X-ray diffraction, and geochemical and petrographic analyses as the lizardite member of the serpentine mineral series. Lizardite is a significant ( approximately 20-30%) clast type along with clinochlore ( approximately 75%) in the dolomite-cemented breccia. We have also detected disseminated lizardite elsewhere in the Burgess Shale including: fossil-bearing strata of the Campsite Cliff Shale Mbr at the Trilobite Beds; several horizons in the Burgess Shale section at Fossil Ridge; and, in muscovite-rich mud slurry deposits in the Raymond Quarry Shale Mbr(?) at a fossil site on the North Shoulder of Mt Stephen. The presence of serpentine in the Burgess Shale is a “smoking gun”, providing necessary and sufficient evidence for deep sourced, hydrothermal Mg brines and associated mud volcanism. Implications for paleoecologic interpretations of associated biota and for understanding the evolution of the Kicking Horse Rim are major. The brines produced a massive magnesium metasomatic feature here named the Kicking Horse Rim Magnesium Anomaly ( approximately 100 km long and up to 15 km wide). This anomaly includes the well known Kicking Horse and Monarch Pb-Zn-(Ag) deposits, the Mt. Brussilof magnesite deposit, numerous probably protrusive talc bodies (especially the cluster around Talc Lake), and the abundant widespread hydrothermal dolomites that have largely replaced the westerly extent of the middle Cambrian Eldon and Cathedral carbonate platforms. The above features are all ascribed to Mg-CO (sub 2) -Cl brines generated during mantle heating, dehydration, and steatization of serpentinite in the mid-to lower crust beneath the Kicking Horse fault system in middle Cambrian time. Brines and mud volcanism were likely major factors in the distribution and rapid burial of fossil assemblages in Middle Cambrian deposits along the Kicking Horse Rim. These observations provide impetus to investigate other Cambrian lagerstatten to determine if deep-sourced serpentinization-derived materials are present and, if so, determine their potential paleoecologic and evolutionary implications.
Key words
| Book Format | Print to Order, Digital Version |
|---|
Abstract
12-4 Keith, Stanley B., Johnston, Paul A., and Johnston, Kimberley J., 2017, A serpentinite “smoking gun” in the Burgess Shale; evidence for deep-sourced magnesium-charged hydrothermal brines and mud volcanism that fueled the Burgess biosystem: Abstracts With Programs Geological Society of America, v. 49, no. 6, Abstract No. 30-5.
ABS
Re-examination of a clinochlore (Mg-chlorite)/dolomite-dominated breccia, collected in 2009 at the Fossil Gully Fault upslope from the Mt Stephen Trilobite Beds, revealed a population of exotic clasts that resembled serpentinite. The serpentinite has now been confirmed by X-ray diffraction, and geochemical and petrographic analyses as the lizardite member of the serpentine mineral series. Lizardite is a significant ( approximately 20-30%) clast type along with clinochlore ( approximately 75%) in the dolomite-cemented breccia. We have also detected disseminated lizardite elsewhere in the Burgess Shale including: fossil-bearing strata of the Campsite Cliff Shale Mbr at the Trilobite Beds; several horizons in the Burgess Shale section at Fossil Ridge; and, in muscovite-rich mud slurry deposits in the Raymond Quarry Shale Mbr(?) at a fossil site on the North Shoulder of Mt Stephen. The presence of serpentine in the Burgess Shale is a “smoking gun”, providing necessary and sufficient evidence for deep sourced, hydrothermal Mg brines and associated mud volcanism. Implications for paleoecologic interpretations of associated biota and for understanding the evolution of the Kicking Horse Rim are major. The brines produced a massive magnesium metasomatic feature here named the Kicking Horse Rim Magnesium Anomaly ( approximately 100 km long and up to 15 km wide). This anomaly includes the well known Kicking Horse and Monarch Pb-Zn-(Ag) deposits, the Mt. Brussilof magnesite deposit, numerous probably protrusive talc bodies (especially the cluster around Talc Lake), and the abundant widespread hydrothermal dolomites that have largely replaced the westerly extent of the middle Cambrian Eldon and Cathedral carbonate platforms. The above features are all ascribed to Mg-CO (sub 2) -Cl brines generated during mantle heating, dehydration, and steatization of serpentinite in the mid-to lower crust beneath the Kicking Horse fault system in middle Cambrian time. Brines and mud volcanism were likely major factors in the distribution and rapid burial of fossil assemblages in Middle Cambrian deposits along the Kicking Horse Rim. These observations provide impetus to investigate other Cambrian lagerstatten to determine if deep-sourced serpentinization-derived materials are present and, if so, determine their potential paleoecologic and evolutionary implications.
Key words
MosheBob
Ranta och lana pengar
Larlenia
Pills prescribing information. Label names. [url=https://dapoxetine.pics]tadalafil and dapoxetine[/url] priligy usa - https://dapoxetine.pics Most adroitly hot item roughly drug. Persuade here.
aluplime
can i get cheap xenical without a prescription where can i buy xenical prices buying generic xenical without insurance https://dietpharm.net/ Good information. With thanks.
Crurorb
female cialis can i take 40mg of cialis kamagra chewable tablets https://sefegeneric.com/ Whoa all kinds of wonderful info.
docaDync
dapoxetine online in india priligy seratonin priligy 60mg reviews https://dapoxetinedon.com
Erurbpaf
Whoa quite a lot of beneficial advice. kamagra online kamagra tablets for sale uk cheap kamagra uk paypal Incredible many of awesome tips.
glyncgag
You actually stated that effectively. where to buy priligy dapoxetine 60 mg price priligy tablets
Erurbpaf
Whoa quite a lot of fantastic information. kamagra oral jelly 100mg buy kamagra pills online kamagra 100mg oral jelly sildenafil Incredible a lot of valuable knowledge.
Alattdah
buy vardenafil levitra professional reviews price of levitra [url=https://www.otclevitra.com/]levitra pills[/url]
Alattdah
generic levitra online cialis vs levitra levitra pill [url=https://www.otclevitra.com/]maximum dose of levitra[/url]
ErarpFuh
levitra 20 mg tablet levitra dose levitra dosage how long does it last
MiniBler
stromectol [url=https://stromectolverb.com/]ivermectin for humans walmart[/url].
noupeRex
- ivermectin how to buy ivermectin anti parasite pills.
Headohag
furosemide generic furosemide
Nubsrori
does sildenafil 20 mg work sildenafil
Guanktum
furosemide 20 mg tablet http://furosemide.sbs furosemide 40 mg
Shealay
cost of ventolin in usa severe asthma medications
rwhy78
albuterol sulfate side effects proventil inhaler
isal81
viagra pills for women viagra sale northern ireland
Drilerog
furosemide 40 mg medication lasix furosemide 20 mg for dog [url=https://furosemidevs.com/]furosemide 20[/url] 40 mg furosemide too much
dpcdep
anti parasitic medicine for humans ivermectin tablets
AndrewBrano
canadian online pharmacy no prescription cialis dapoxetine buy tadalafil does cialis keep you hard after coming
AndrewBrano
cialis from usa tadalafil 20mg cialis med dapoxetine
AndrewBrano
cheap cialis free shipping tadalafil without a doctor's prescription where to buy cialis in canada
ocrzto
zithromax z pak cost zithromax walmart cost azithromycin over counter walmart [url=https://azithromycinfest.com/]azithromycin over counter substitute[/url] azithromycin 250 mg side effects
AndrewBrano
generic cialis online purchase tadalafil 20mg cialis/dapoxetine
AndrewBrano
cialis with dapoxetine from canada generic tadalafil 20mg india cialis vs viagra germany
CraigPek
mexican viagra viagra over the counter walmart viagra over the counter
CraigPek
viagra from india pfizer viagra 100mg price mexican viagra
CraigPek
how much is viagra sildenafil citrate tablets 100 mg buy generic 100mg viagra online
JamesPaX
stromectol 12 mg tablets stromectol buy online uk ivermectin poisoning in humans
JamesPaX
stromectol for humans for sale ivermectin paste dosage for dogs stromectol for humans for sale
JamesPaX
stromectol 3 mg tablet price stromectol order online stromectol for humans for sale
MichaelSauro
clomid tablets buy clomid 50mg online clomid for sale
MichaelSauro
where to buy cheap clomid online clomid tablets where to buy cheap clomid online
MichaelSauro
stromectol without a doctor prescription stromectol for sale stromectol price usa
MichaelSauro
tadalafil 10mg price tadalafil 10mg price cialis 20 mg price
MichaelSauro
price for viagra sildenafil 100 mg lowest price sildenafil
MichaelSauro
generic tadalafil 20mg india where to buy liquid cialis where to buy liquid cialis
Canadanuamy
stromectol for humans for sale stromectol stromectol without a doctor prescription
Canadanuamy
stromectol for sale prescribing stromectol stromectol for sale
Canadanuamy
buying from canadian online pharmacies buy prescription drugs online cheap reputable canadian mail order pharmacies
CharlesZew
buy propecia 5mg propecia purchase propecia buy
CharlesZew
buy prescription drugs online legally ed prescription drugs prescription drugs without doctor approval
CharlesZew
does oral ivermectin kill demodex mites ivermectin 12 mg topical ivermectin for humans
CharlesZew
pyrantel vs ivermectin ivermectin 9 mg ivermectin pour-on for goat mites
CharlesZew
finasteride online bonus mail order propecia purchase finasteride without a prescription
CharlesZew
cheap pet meds without vet prescription legal to buy prescription drugs without prescription best canadian pharmacy online
CharlesZew
ed meds п»їerectile dysfunction medication ed pill
WilliamLes
ivermectin for cat ear mites ivermectin apple paste ivermectin pills for lice
WilliamLes
ed men erectile dysfunction ed drug comparison
WilliamLes
non prescription ed pills carprofen without vet prescription overcoming ed
WilliamLes
best treatment for ed ed drugs ed treatments
WilliamLes
prednisone cream brand name buy prednisone how much is prednisone 10mg
WilliamLes
prednisone 50 mg buy prednisone for sale prednisone 2 mg
WilliamLes
best ed medications ed pills ed drugs compared
MontePhisk
[url=http://cheapdrugs.store/#]ed cure[/url]