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Genesis and Geological Significance of Hydrothermal Sedimentary Rock in Jiangjiawan, Gansu

Author: LinWei
Tutor: HuNengGao
School: Chang'an University
Course: Minerals, rocks , mineral deposit geology
Keywords: Kang Hydrothermal Sedimentary Cherts Petrogenesis Tectonic environment
CLC: P588.2
Type: Master's thesis
Year: 2009
Downloads: 57
Quote: 0
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Abstract


Jiang Jia Wan area are Mian slightly tectonic background, through field observations, analysis of studies of petrology, mineralogy, geochemistry, and re-determined the area of ??rock combination stratigraphic relationships, discussed the petrogenesis, tectonic setting and mineralization, which raised its geological significance in the region. Achieved understanding is as follows. District phyllite protolith pelite, trace elements and REE North American shale are similar, both with the same characteristics as the argillaceous rocks, it can certainly protolith terrigenous argillaceous sedimentary. A 3 horizon platy minerals sericite, It can be speculated quite single deposition muddy ingredients, should be based on the adsorption of a certain amount of K of high Ridge stony clay-based deposition. 2. By cherts occurrence, mineral composition, structure, tectonic and geochemical characteristics seen for hot water sedimentary rocks, siliceous rocks in the area (quartz schist class), during deposition of terrigenous (argillaceous) deposition of mixed, hot water circulation through the source region of the continental crust, felsic crystalline basement of the area may Archean - Mesoproterozoic metamorphic the body (Yudongzi rock group) and in - Late Proterozoic low-grade metamorphic volcanic rocks ( Bikou rock group). Phyllite, quartz schist analysis: A 2 A 3 and B horizons, is a product of the hydrothermal sedimentary and terrigenous binary mixtures , where A 2 and B layer part of the horizon to the hot water deposited mainly the A 3 layer and most of the B layer bit mainly terrigenous, formed in deeper water, A 2 and A of continuous change of REE and trace element 3 layers each sample may be a reflection of the binary mixtures endmember combination change, while the B layer and their differences reflect differences in provenance and sedimentary media. Petrochemistry, REE and trace element geochemistry of not only reflects A 2 , A 3 and B common ingredients on the horizon, is also reflected on the depositional environment. common, and may determine its depositional environment for the passive continental margin. 4. Research in this area shows that the hydrothermal deposition environment aulacogen, hot water circulation through the source region of the continental crust (crystallization bases in the area, Yudongzi rock group Bikou rock group), not oceanic crust, indicating The Middle Devonian area has not yet formed ocean basin, Middle Devonian Mian slightly tectonic environment consistent; area source of ore or mineralized layer is a set of hot sedimentary characteristics sericite quartz ( piece) - sericite K-feldspar British rock (piece of) rock - sericite quartz K-feldspar rock stratabound characteristics, ruled out the possibility of original rock quartz sandstone, cherts gold mineralization is not broken bifida alteration type Bikou Group may gold initial indirect source of ore, exploration and exploitation of this understanding in the area of ??gold has a certain significance. In addition, the paper work done Mian Lu? Encyclical  forced to interrogate yao stunned Mu  the irresolute cellar core pit the Fortunately, Huan ǖ neon spasm squatting meal of the day 谩

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CLC: > Astronomy,Earth Sciences > Geology > Petrology > Classification of rocks > Sedimentary rocks
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