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Mineral Geochemical Characteristics and Genetic Mechanism of Olivine Rocks in Shangnan, Shanxi

Author: YuHong
Tutor: SuLi
School: Chinese Geology University (Beijing)
Course: Geochemistry
Keywords: Qinling orogenic belt Songshugou peridotite Geochemistry Mineral trace elements Chrome spinel
CLC: P588.125
Type: Master's thesis
Year: 2011
Downloads: 86
Quote: 0
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Abstract


Qinling orogenic belt running through the middle of the Chinese mainland, the North China block and Yangtze block binding region, the evolutionary history of geology has been the research focus. - Shangdan fault northern Shangnan Songshugou, region in China largest peridotite outcrops main suture zone in the Qinling orogenic belt, the rock mass is the bottom of the ophiolite mantle peridotite far there is a big controversy. Qinling orogenic belt tectonic evolution of the mode in-depth study of the problem is directly related to the genetic type of the peridotite. This article select the rock mass as the research object, on the basis of geological investigation, petrology, geochemistry, mineral chemical elements characteristics to explore in depth the causes and diagenetic evolution, and obtained the following main results: a geological field investigation showed that , Songshugou intrusion by dunite, harzburgite, through pyroxenite composition the common symmetry zoning phenomenon; the rock mass dunite, diopside peridotite through pyroxenite form a common symmetry zoning: both sides of the phase dunite or clip a small amount of the harzburgite lens body, inward order diopside peridotites and transparency pyroxenite center phase containing diopside stone strips dunite outcrop area of ??20 The Km 2 , dunite outcrop area of ??more than 95%; structure and under the microscope of of 2 Songshugou pluton characteristics grained peridotite residual block after mylonitized, does not have the upper mantle plastic flow transformation characteristics; Songshugou olive changes in the chemical composition of the rock mass range is narrow, that the ingredient is very uniform. Songshugou dunite and harzburgite contains high MgO (45.69% -48.27%) and abnormally low A1 2 O 3 (0.05% -0.73 %), CaO (0.06% -0.68%), K 2 O (lt; 0.2%), Na 2 O (0.01% -0. 18%), TiO 2 (lt; 0.01%) MgO diopside peridotite is very low (25.74% -27.66%), CaO content is very high (14.51% -15.24%); Songshugou dunite rock The rare earth content is much lower than the standard chondrites. The rare earth elements show the relative enrichment of LREE rightist mode, ΣHREE the lower distribution mode is more gentle. Spider diagram displayed on the enrichment of incompatible elements Ba, U, Sr, etc. These characteristics are different from ophiolite type mantle peridotite. Diopside peridotite ΣREE significantly higher than the first two. Mineral constant element oxides and trace elements of the figure shows the same three magma sources; 5 in Songshugou area not seen podiform chromite spinel peridotite, Songshugou and our typical tectonic environment spinel compared The results show that: the pluton chrome spinel Songshugou component differs from the ophiolite mantle peridotite cumulate rocks ingredient, chrome spinel composition cast point drop in the intrusive complex ingredients area; 6 rock The learning element geochemistry and spinel, olivine, rhombic pyroxene mineral composition characteristics reveal Songshugou the bottom of the peridotite and ophiolite residual mantle peridotite significant differences. Mainly concentrated in the rock mass surrounding veined output diopside peridotite, mafic lava structure in place stage fusible component formed crystalline product.

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CLC: > Astronomy,Earth Sciences > Geology > Petrology > Classification of rocks > Magmatic rocks ( igneous ) > Intrusive rocks, plutonic > Ultrabasic rocks
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