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Tectonic Setting and Petrogenesis Analysis of Xiaorequanzi Formation in Shanshan Xinjiang

Author: PanShaoZuo
Tutor: JiangChangYi
School: Chang'an University
Course: Minerals, rocks , mineral deposit geology
Keywords: The Xiaorequanzi group Geochemistry Petrogenesis Magmatic evolution
CLC: P588.14
Type: Master's thesis
Year: 2009
Downloads: 113
Quote: 0
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Abstract


Within the Junggar plate the Xiaorequanzi group is located Dananhu island arc, located in the area north of the survey area Kangguer fault zone. Previous Dananhu Island arc with a more in-depth studies, but it on Xiaorequanzi group degree of research is still limited. Therefore, this article by the Xiaorequanzi volcanic rocks of petrographic, isotopic geochronology, REE and trace element geochemistry system, scientific proof the magmatic nature the Group Xiaorequanzi volcanic rocks, magma evolution and petrogenesis . Combination of field investigation and laboratory research, following superficial understanding: 1, Xiaorequanzi Group volcanics main rock types: basalt, basaltic andesite, trachyte, trachyandesite, rough dacite , dacite, rhyolite, andesitic, dacitic and rhyolitic volcanic breccia and tuff, dark gray alteration gravel - coarse-grained lithic sandstone, dark gray alteration sandy conglomerate. 2 fresh rhyolite rock samples taken within the in Xiaorequanzi group after the Beijing SHRIMP experimental center SHRIMP zircon U-Pb dating method, test its formation age of 325 ± 3.2Ma is Early Carboniferous de dock order. , Xiaorequanzi volcanic rocks of total REE, LREE enrichment, losses of heavy rare earth elements and heavy REE fractionation weak, strong fractionation of light rare earth elements. Enriched in large ion lithophile elements, high field strength elements, especially Nb, Ta strongly depleted in compatible elements V, Cr, Ni strong losses. Showed a calc-alkaline volcanic rocks of the island arc environment. 4 Xiaorequanzi group volcanic rocks are distributed from mafic to felsic. Mafic volcanic island arc environment typical of calc-alkaline basalt, rich in LILE and LREE metasomatized by subducted slab dehydration reaction to form the partial melting of the overlying mantle wedge peridotite formed. Intermediate volcanic rocks of mafic volcanic rocks through their own separation crystal evolution and formation. Acid rock is formed by partial melting of subducted oceanic crust overlying wedge mantle underplating of mantle-derived magma heated lead near the Moho crust partial melting. 5, the main mineral of Xiaorequanzi volcanic rocks of fractional crystallization for clinopyroxene, plagioclase fractional crystallization of magma evolution in the role of the weak. In mafic magma emplacement process by a certain degree of assimilation, but still enrichment main source region.

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CLC: > Astronomy,Earth Sciences > Geology > Petrology > Classification of rocks > Magmatic rocks ( igneous ) > Extrusive (volcanic )
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