Carre-Shinob/Powell connection

Discussion of the ever elusive location we've come to know as Carre-Shinob ... is it fact or legend?

Carre-Shinob/Powell connection

Post Number:#26  Postby Jornada » Tue Mar 04, 2003 10:04 am

Your comment is noteworthy,
Leidy Dike, if it is gabbro only proves my point. As a general rule the most common parent rocks or basement rocks are igneous-plutonic rocks (granite, syenite, diorite,gabbro) while the feldspathic rocks, argillites, sandstones, most conglomerates as well as many of the low-grade metamorphic rocks are sedimentary are often reffered to as parent rock, but the come under the term "gneiss" out of the parent structure. Most granites and gabbro of medium to course grain texture (phaneritic) contain phenocrysts of well-formed
crystals of potash feldspars and can contain hornblende as well. There are several different combinations of minerals that form the granite's and gabbro's, not enough space to cover all the combo's. Depending on the mineral combination, you can have high silica content or low silica content. Generally speaking the color of these materials tend to be white-ish and ranging to medium gray to dark gray, with the darkening being infulenced by ferromagnesian minerals. If the rocks display a color of flesh-colored, pink, red to deep red, then it indicates the presence of hematite flakes, generally from orthoclase. Remember, granite,gabbro as well as others have been used as a collective term in the Geology Field for a number of related leucocratic, plutonic rocks that have similar chemical and mineralogical compositions.
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Carre-Shinob/Powell connection

Post Number:#27  Postby lostreasureman » Wed Mar 05, 2003 2:27 pm

well allrittie then...that sounds like"rock talk"ta me!!!:hat
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Carre-Shinob/Powell connection

Post Number:#28  Postby Azide » Wed Mar 05, 2003 2:46 pm

I, too, must concur with the previous notion.:rolleyes :smokin
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Post Number:#29  Postby mrjimsfc » Fri Mar 07, 2003 12:44 am

It should be helpful to note that metalic minerals are rarely found in the pluton or dike itself. Minerals are usually found in the rocks that were intruded/altered by the pluton or dike. I'm sure Jornada can expound at lenth on that subject. When it comes to geology, he obviously has his act together.:eek

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Post Number:#30  Postby lostreasureman » Fri Mar 07, 2003 2:41 am

sounds like thats fer shure!!!!!:hat
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Post Number:#31  Postby Jornada » Fri Mar 07, 2003 6:40 am

You are right mrjimsfc. At least in part. In Nevada where a great number of Pluton's exist, there has been ore associated with them in areas, for example, the famous Tuscarora Mining District. Plutons range in size from as little as 1 mile exposures to several miles in length. Those plutons were responsible for the large crystal deposits of mainly gold in the Tuscarora Mines. At one location in Nevada there is a hill with all of the attributes of a pluton. All around this suspected pluton there are hot springs that are dried up. Similar to the McLaughlin Mine in Napa and Yolo California. These hot springs hot springs indicate that there was vulcanism present beneath the hill thus forming a pluton. Combine a pluton with a fault system running into or adjacent to the pluton and generally there will be extensive fracturing. These fractures form open fissures and fill with the hot solutions prior to the cooled state of the crust now. A Pluton is nothing more than a small Batholith not exceeding 100 meters of exposed rock. If the old hot springs were present during the time of vulcanism, then generally epithermal veins and hydrothermal veins form. The low concentrations of gold normally are associated with hydrothermal veins with the highest concentration of gold occuring in the epithermal veins.
These epithermal veins are formed at less than 1,000 meters from the surface at low tempreature ranging between 50 and 200 degress centigrade. When the fluids are discharged from the vulcanism, the extreme pressure and heat forces the fluids to the surface and as they circulate the dissolve the minerals placing them in fluid form. When the fluids cool sufficiently along with the pressure, then the minerals precipitate in the fissures and along the walls usually in quartz veins that contain high amounts of silica. Now if these fractures and block faulting extends into the plutons, then they as well as the surronding mineralized area will have substancial ore deposits. Now for those of you who don't know. VIRGINA CITY was a batholith, or as I stated earlier, a huge oversize pluton overlaid on the side of the mountain where the ore was discovered. I hope this helps you with your hunting.
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