| 鲁西地区角闪石岩地球化学、矿物学特征及其地质意义 |
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| 关键词:Western Shandong area hornblendite geochemistry mineralogy oxygen fugacity |
| 基金项目:山东省2019年度省级地质勘查项目“山东省1:5万马站;圈里幅区域矿产地质调查”(编号: 鲁勘字(2019)19号) |
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| Geochemical and Mineralogical Characteristics of Hornblende in Western Shandong and Their Geological Significance |
| Dike groups are formed under extensional background and are an important indicator for tracking mantle source characteristics, and continental and supercontinental rupture. Hornblende rocks in Western Shandong enable the evaluation of Paleoproterozoic magma source and tectonic evolution. In the present study, petrographic, whole-rock geochemical, and in situ analyses of amphibole and biotite in the Western Shandong area were carried out. Hornblende rocks with intraplate tectonic setting from enriched mantle were employed. According to an analysis of the origin of hornblende and biotite, both were of mantle origin. The crystallization temperature of hornblende was 702~781℃. Further, hornblende had a crystallization pressure of 29.8~228.8 MPa, crystallization depth of approximately 1~7.5 km, and its oxygen fugacity varied from NNO+2.68 to NNO+3.35 during crystallization. As the U-Pb age of hornblende apatite was (1817±35) Ma, (1817±35) Ma in the Western Shandong area was considered to be in the in-plate tensile environment, where mantle derived magma transgression occurs, and the stage of continental cracking is entered. |
| WANG Kai-kai,LIU Chuan-peng,DENG Jun,LIANG Cheng,LIU Tong.2021.Geochemical and Mineralogical Characteristics of Hornblende in Western Shandong and Their Geological Significance[J].Acta Geoscientica Sinica,42(6):771-784. |
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