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Proterozoic anorogenic magmatic rocks and their constraints on mineralizations in the Bayan Obo deposit region, Inner Mongolia

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Science China Earth Sciences 2003年第z1期46卷 26-40页

作者：王一先裘愉卓高计元张乾 Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China Institute of Geochemistry Chinese Academy of Sciences Gulyang 550002 China Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China

The Proterozoic anorogenic magmatic rocks are well developed in the Bayan Obo de-posit region. They are composed of trachyte, magnesioarfvedesonite-feldspatite, potash-rhyolite, dacite, rhyolite, quartz porphyry and trachy basalt. A lot of high-K diabase veins (dykes) are also found. These anorogenic magmatic rocks are derived from the mantle. They have lower eM (t) (4.52-5.88) with TDMNd =1.54-1.92 Ga. Their Nd isotopic compositions and TDMNd are consistentwith those of ores, implying that the ore-forming materials were derived from these anorogenic magmatic rocks. The zircon U-Pb ages of the rocks are 1.8 Ga. Research results indicate that the Bayan Obo Group was replaced by the hydrothermal solution related to the anorogenic magmatic rocks, resulting in the formation of the deposit.

关键词： Bayan Obo, Proterozoic Era, anorogenic magmatic rocks, isotope, deposit genesis.

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Evolution of the Mesozoic Granites in the Xiong'ershan-Waifangshan Region,Western Henan Province,China,and Its Tectonic Implications

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Acta Geologica Sinica(English Edition) 2007年第2期81卷 253-265页

作者： NAN Yigui ZHANG Shihong Franco PIRAJNO ZHANG Yuanhou State Key Laboratory Geological Processes ana Minerat Resources China University of Geosciences Beijing 100083 China Geological Survey of Western Australia 100 Plain Street East Perth WA 6004 Australia The College of Earth Sciences Jilin University Changchun 130061 China

Based on the new data of isotopic ages and geochemical analyses, three types of Mesozoic granites have been identified for the Xiong＇ershan-Waifangshan region in western Henan Province： high-Ba-Sr I-type granite emplaced in the early stage （-160 Ma）, I-type granite in the middle stage （-130 Ma） and anorogenic A-type granite in the late stage （-115 Ma）. Geochemical characteristics of the high-Ba-Sr I-type granite suggest that it may have been generated from the thickened lower crust by partial melting with primary residues of amphibole and garnet. Gradual increase of negative Eu anomaly and Sr content variations reflect progressive shallowing of the source regions of these granites from the early to late stage. New ^40Ar/^39Ar plateau ages of the early-stage Wuzhangshan granite （156.0±1.1 Ma, amphibole） and middle-stage Heyu granite （131.8±0.7 Ma, biotite） are indistinguishable from their SHRIMP U-Pb ages previous published, indicating a rapid uplift and erosion in this region. The representative anorogenic A- type granite, Taishanmiao pluton, was emplaced at -115 Ma. The evolution of the granites in this region reveals a tectonic regime change from post-collisional to anorogenic between -160 Ma and -115 Ma. The genesis of the early- and middle-stage I-type granites could be linked to delamination of subducted lithosphere of the Qinling orogenic belt, while the late-stage A-type granites represent the onset of extension and the end of orogenic process. In fact, along the Qiniing -Dabie-Sulu belt, the Mesozoic granitoids in western Henan, Dabieshan and Jiaodong regions are comparable on the basis of these temporal evolutionary stages and their initial ^87Sr/^86Sr ratios, which may suggest a similar geodynamic process related to the collision between the North China and Yangtze cratous.

关键词： granite Mesozoic high Ba-Sr, ^40Ar/^39Ar dating post-collision anorogenic western Henan

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