$0.00
Abstract
1-3 Rasmussen, Jan C., 2012, Geology, mines, and minerals of the Tombstone area (extended abstract): Minerals of Arizona, Twentieth Annual Symposium, Flagg Mineral Foundation, April 14, 2012, p. 1-5.
Abstract
1-3 Rasmussen, Jan C., 2012, Geology, mines, and minerals of the Tombstone area (extended abstract): Minerals of Arizona, Twentieth Annual Symposium, Flagg Mineral Foundation, April 14, 2012, p. 1-5.
ABS
Numerous episodes of mountain building and sedimentation have left a record in the rocks of the Tombstone Hills. The oldest rocks there are the phyllites and metarhyolites of the Pinal Schist, which was dated at 1,695 Ma in the nearby Little Dragoon Mountains (Silver, 1967). It is intruded by granite, which may be similar to the granite dated at 1,420 Ma in the nearby Little Dragoon Mountains (Silver, 1978). The Precambrian rocks are unconfonnably overlain in the Tombstone Hills by a thick sequence of Paleozoic quartzite, limestone, and siltstone ranging in age from Cambrian ( about 500 Ma) through Permian (about 250 Ma). These sedimentary rocks generally are excellent hosts to mineralization, as the limestones are reactive and the more resistant quartzites fracture easily under tectonic stress and provide pathways for veins and mineralization.
The Laramide orogeny (85-43 Ma) is represented in the Tombstone Hills by three structural and two igneous-mineralization types. The east-west faulting that uplifted Government Butte was emplaced early in the Laramide and may be related to early movement on the Prompter fault. The silver mineralization in the main district was emplaced in association with northeast structures and caldera volcanism and intrusive rocks (74 Ma). A later intrusion of quartz monzonite porphyry and rhyolite (63 Ma) in the northern and eastern Tombstone Hills is of the same age and style as porphyry copper mineralization elsewhere in southern Arizona (Wilt, 1993).
Key words
Book Format | Print to Order, Digital Version |
---|
Abstract
1-3 Rasmussen, Jan C., 2012, Geology, mines, and minerals of the Tombstone area (extended abstract): Minerals of Arizona, Twentieth Annual Symposium, Flagg Mineral Foundation, April 14, 2012, p. 1-5.
ABS
Numerous episodes of mountain building and sedimentation have left a record in the rocks of the Tombstone Hills. The oldest rocks there are the phyllites and metarhyolites of the Pinal Schist, which was dated at 1,695 Ma in the nearby Little Dragoon Mountains (Silver, 1967). It is intruded by granite, which may be similar to the granite dated at 1,420 Ma in the nearby Little Dragoon Mountains (Silver, 1978). The Precambrian rocks are unconfonnably overlain in the Tombstone Hills by a thick sequence of Paleozoic quartzite, limestone, and siltstone ranging in age from Cambrian ( about 500 Ma) through Permian (about 250 Ma). These sedimentary rocks generally are excellent hosts to mineralization, as the limestones are reactive and the more resistant quartzites fracture easily under tectonic stress and provide pathways for veins and mineralization.
The Laramide orogeny (85-43 Ma) is represented in the Tombstone Hills by three structural and two igneous-mineralization types. The east-west faulting that uplifted Government Butte was emplaced early in the Laramide and may be related to early movement on the Prompter fault. The silver mineralization in the main district was emplaced in association with northeast structures and caldera volcanism and intrusive rocks (74 Ma). A later intrusion of quartz monzonite porphyry and rhyolite (63 Ma) in the northern and eastern Tombstone Hills is of the same age and style as porphyry copper mineralization elsewhere in southern Arizona (Wilt, 1993).
Key words
Michaeltiz
generic viagra walmart sildenafil 20 mg where to buy viagra
Michaeltiz
viagra from india sildenafil citrate tablets 100 mg viagra 100mg price
EddieCaush
stromectol 12 mg tablets ivermectin tractor supply stromectol for sale
EddieCaush
stromectol tablets for humans stromectol for humans for sale stromectol for sale
EddieCaush
stromectol for humans for sale stromectol 12 mg tablets stromectol 12 mg tablets
JohnnyfergY
sildenafil citrate 100mg for sale price for viagra price for viagra
JohnnyfergY
clomid for sale clomid buy clomid 50mg
JohnnyfergY
stromectol pills for humans stromectol for humans for sale stromectol for humans for sale
JohnnyfergY
clomid buy clomid 50mg clomid for sale
JohnnyfergY
buy clomid 50mg clomid for sale canada where to buy cheap clomid online
JohnnyfergY
sildenafil viagra where to buy sildenafil 100 mg
NormanDerry
ed medications medicine for impotence ed pills for sale
NormanDerry
mens erection pills cure ed generic ed pills
NormanDerry
buying from canadian online pharmacies canada rx drugs online prescription drugs without doctor approval
Rogerduawn
male ed pills ed pill medicine for impotence
Rogerduawn
canada ed drugs online prescription for ed meds canadian drugs online
Rogerduawn
cat antibiotics without pet prescription how to get prescription drugs without doctor prescription drugs
Rogerduawn
top ed drugs ed pills ed pill
Rogerduawn
pills for ed cheap ed pills cheap erectile dysfunction pill
Rogerduawn
can i take ivermectin every day stromectol dosage for scabies ivermectin 1.87 dosage for humans
Rogerduawn
ed treatment drugs treatments for ed cheap ed drugs
JeffreyHefly
buying generic cialis online safe cialis cialis paypal payment canada
JeffreyHefly
canada buy prednisone online buy prednisone online generic prednisone pills
JeffreyHefly
back pain from cialis cialis usa online cost of cialis 20mg
JeffreyHefly
natural help for ed canadian online drugs homeopathic remedies for ed
JeffreyHefly
ivermectin paste for cattle ivermectin for humans dosage is stromectol over the counter
JeffreyHefly
buy ivermectin nz ivermectin for ivermectin lotion 0.5
JeffreyHefly
prednisone brand name us prednisone 10 mg tablet prednisone ordering online
JeffreyHefly
ivermectin pour on ivermectin mexico ivermectin and dexamethasone
MontePhisk
[url=http://cheapdrugs.store/#]best ed pills that work[/url]