青海拉脊山东段白家藏侵入岩锆石U-Pb年代学、地球化学特征及其地质意义

doi:10.13278/j.cnki.jjuese.20190113

Abstract

Abstract: The intrusive rocks of Baijiazang is located in Minhe County, Qinghai Province, and the geotectonic position is located in the eastern section of Lajishan ophiolis melange belt. Through petrology, petrogeochemistry and isotopic chronology, the intrusive rocks of Baijiazang have been studied in order to determine their time of emplacement and to explore the tectonic environment. The results show that the intrusive rocks in Baijiazang are mainly composed of diorite and quartz diorite. Zircon U-Pb age obtained from diorite and quartz diorite is (472.5±1.9) Ma and (467.3±2.5) Ma, respectively, and they are consistent within the error range. Therefore, it can be judged that the emplacement age of Baijiazang rock is about 470 Ma, which is Middle Ordovician. The geochemical characteristics show that the SiO₂ content of the rock mass is 55.67%-59.04%. The value of Na₂O/K₂O was 3.35-6.14, and w (Na₂O) was higher than of w (K₂O), showing the characteristics of rich in sodium and poor in potassium. The main body of A/CNK value is between 0.76 and 1.01, belonging to the quasi-aluminum calc-alkaline series rocks. The rare earth partition curve presented a slightly right-leaning curve, where light rare earth elements were relatively weakly enriched ((La/Yb)_N=2.51-4.57), and light and heavy rare earth elements were weakly fractionated internally. The rocks were obviously enriched with large ion lipophilic elements Rb, Ba and active incompatible elements Th and U, while relatively deficient with high-field strength elements Nb, Ta, P, Ti, etc. Environmental discrimination shows that it has the characteristics of island-arc granite. The above characteristics indicate that the intrusive rocks in Baijiazang were produced at the subduction stage of the Lajishan ocean.

Key words: geochemistry, zircon U-Pb age, petrogenesis, subduction, Middle Ordovician, Lajishan

CLC Number:

P588.12

Zhang Xinyuan, Li Wufu, Wang Chuntao, Liu Jiandong, Ouyang Guangwen. Zircon U-Pb Dating, Geochemistry and Their Geological Significance of Baijiazang Pluton in Eastern Section of Lajishan in Qinghai Province[J].Journal of Jilin University(Earth Science Edition), 2020, 50(6): 1703-1719.

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Zircon U-Pb Dating, Geochemistry and Their Geological Significance of Baijiazang Pluton in Eastern Section of Lajishan in Qinghai Province

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[7]	Xiong Guangqiang, Liu Min, Zhang Da, Wang Zhong. Geochemistry and Geochronology of Gabbro in Diyanmiao Ophiolite Belt, West Ujimqin Banner, Inner Mongolia [J]. Journal of Jilin University(Earth Science Edition), 2020, 50(5): 1599-1614.
[8]	Yu Changsheng, Yang Yanchen, Han Shijiong, Yang Kunlin, Song Zhaoyang, Zhang Yihang, Wang Wang. Petrogenesis of Moyite from Xiagalaiaoyi Pb-Zn Deposit in Great Xing’an Range and Its Geological Significance [J]. Journal of Jilin University(Earth Science Edition), 2020, 50(4): 1042-1058.
[9]	Ren Wenkai, Wang Shengyun, Chen Libiao, Wu Shaofeng, Zhang Haiqing. LA-ICP-MS Zicon U-Pb Geochronology, Geochemistry and Geological Significance of Granodiorites in Lancai Area, Tongren, Qinghai [J]. Journal of Jilin University(Earth Science Edition), 2020, 50(4): 1059-1074.
[10]	Ren Yunsheng, Liu Xiaohe, Shang Qingqing, Chen Cong, Yang Qun, Hao Yujie, Sun Zhenming. Geochemistry and Geochronology of Ore-Bearing Formation in Jinan BIF-Type Iron Deposit in Helong Area, Jilin Province [J]. Journal of Jilin University(Earth Science Edition), 2020, 50(3): 800-814.
[11]	Meng Qingtao, Li Jinguo, Liu Zhaojun, Hu Fei, Xu Chuan. Organic Geochemical Characteristics and Depositional Environment of Oil Shale of Eocene of Paleocene Youganwo Formation in Yangjiao Mining Area of Maoming Basin [J]. Journal of Jilin University(Earth Science Edition), 2020, 50(2): 356-367.
[12]	Xu Jinjun, Li Ning, Jin Qiang, Liu Jihua, Lou Da, Teng Jiancheng. Geochemical Characteristics and Source Analysis of Carboniferous-Permian Condensate Oil and Gas in Huanghua Depression [J]. Journal of Jilin University(Earth Science Edition), 2020, 50(2): 644-652.
[13]	He Zhonghua, Wang Qizhi, Wang Qiang. Geochemistry and Zircon U-Pb Ages of Clastic Rocks of Zhesi Formation in Suolun Region, Great Xing’an Range: Constraints on Origins of Sediment Provenance [J]. Journal of Jilin University(Earth Science Edition), 2020, 50(2): 405-424.
[14]	Zhang Jian, Zhang Haihua, Chen Shuwang, Zheng Yuejuan, Zhang Dejun, Su Fei, Huang Xin. Geochemical Characteristics and Geological Significance of Upper Permian Linxi Formation in Northern Songliao Basin [J]. Journal of Jilin University(Earth Science Edition), 2020, 50(2): 518-530.
[15]	Chen Huijun, Yu Hongbin, Ma Yongfei, Chen Jingsheng, Qian Cheng, Liu Shiwei, Cui Tianri, Zhong Hui. Zircon U-Pb Age, Petrological Geochemistry and Tectonic Implication of Alkaline Granitein South-Eastern Jilin Province [J]. Journal of Jilin University(Earth Science Edition), 2020, 50(2): 531-541.