Geology and Geochemistry of Basalt in the Kekesentao Ophiolite, Xinjiang
Received date: 2012-07-24
Revised date: 2012-08-23
Online published: 2012-10-10
The newlyfound Kekesentao basalt occures in the north of the Kekesentao ultramafic complex, north Xinjiang. It is composed of basalt and basaltic tuff with thickness of 50 to 80 meters. The basalt generally undergoes schistosition, but porphyritic structure still remained. The geochemistry of rocks shows that the basalt is low alkali (Na2O+K2O<3%, σ=0.60-1.19), low titanium (TiO2=0.73%-1.22%) and magnesiumrich (MgO=7.43%-9.72%) tholeiitic rock series, and might be generated from primary magma characterized by Mg# value of 0.65 to 0.71. The characteristics of low REE contents (ΣREE=29.68×10-6-44.91×10-6), and flat REE and trace elements normalized pattern of the basalt suggest that it form in middleocean ridge tectonic setting. The discovery and geochemical research of the basalt proves the existence of Kekesentao ophiolite suite.
Wang Yuwang , Wang Jingbin , Tang Pingzhi , Zhao Lutong , Shi Yu , Chen Yanfei . Geology and Geochemistry of Basalt in the Kekesentao Ophiolite, Xinjiang[J]. Advances in Earth Science, 2012 , 27(10) : 1100 -1107 . DOI: 10.11867/j.issn.1001-8166.2012.10.1100
[1]Xiao Xuchang, Tang Yaoqing, Feng Yimin, et al. The Tectonic Structure of the Northern Xinjiang and its Adjacent Regions[M]. Beijing: Geological Publishing House, 1992.[肖序常,汤耀庆,冯益民,等. 新疆北部及其邻区大地构造[M]. 北京:地质出版社,1992.]
[2]He Guoqi, Li Maosong. New achievement in researching ophiolitic belts in central Asia and its significance in the links of tectonic belts between Northern Xinjiang and adjacent area[J]. Xinjiang Geology, 2000, 18 (3): 193-202.[何国琦,李茂松. 中亚蛇绿岩带研究进展及区域构造连接[J].新疆地质,2000,18 (3): 193-202.]
[3]Buslov M M, Safonova I Y, Watanabe T, et al. Evolution of the Paleo-Asian Ocean (Altai-Sayan region, Central Asia) and collision of possible Gondwana-derived terranes with the southern marginal part of the Siberian continent[J]. Geosciences Journal, 2001, 5: 203-224.
[4]Yakubchuk A. Architecture and mineral deposit settings of the Altaid orogenic collage: A revised model[J]. Journal of Asian Earth Sciences, 2004, 23: 761-779.
[5]Li Jinyi, He Guoqi, Xu Xin, et al. Crustal tectonic framework of northern Xinjiang and adjacent regions and its formation[J]. Acta Geologica Sinica, 2006, 80(1): 148-168. [李锦轶,何国琦,徐新,等. 新疆北部及邻区地壳构造格架及其形成过程的初步探讨[J]. 地质学报,2006,80(1):148-168.]
[6]Wang Jingbin, Li Boquan, Zhang Jibin, et al. Copper and Gold Metallogenetic Condition and Prospect Prognosis of the Irtys Ore Belt[M]. Beijing: Metallurgical Industry Press, 1999. [王京彬,李博泉,张积斌,等. 额尔齐斯聚矿带金铜成矿条件及找矿预测[M]. 北京:冶金工业出版社,1999.]
[7]Wang Z H, Sun S, Li J L, et al. Paleozoic tectonic evolution of the northern Xinjiang, China: Geochemical and geochronological constraints from the ophiolites[J]. Tectonics, 2003, 22, 1 014, doi: 10. 1029/2002TC001396.
[8]Wu Bo, He Guoqi, Wu Tairan, et al. Discovery of the Buergen ophiolitic mélange belt in Xinjiang and its tectonic significance[J]. Geology in China, 2006,33(3): 476-486.[吴波,何国琦,吴泰然,等. 新疆布尔根蛇绿混杂岩的发现及其大地构造意义[J]. 中国地质,2006,33(3):476-486.]
[9]Wang Y W, Wang J B, Wang L J, et al. The Tuerkubantao Ophiolite Mélange in Xinjiang, NW China: New evidence for the Erqis suture zone[J]. Geoscience Frontiers, 2012, doi:10.1016/j.gsf.2012.02. 002.
[10]Zhang C L, Santosh M, Zou H B, et al. Revisiting the “Irtish tectonic belt”: Implications for the Paleozoic tectonic evolution of the Altai orogen[J]. Journal of Asian Earth Sciences, 2012, doi:org/10.1016/j.jseaes.2012.02.016.
[11]Zhang Chi. Some geological characters of the ophiolite of Xinjiang[J]. Geological Review, 1981, 7 (4): 307-314.[张弛. 新疆蛇绿岩某些地质特征[J]. 地质论评,1981,7(4):307-314.]
[12]He Guoqi, Li Maosong, Liu Dequan, et al. The Crust Evolution and Its Mineralization of the Paleozoic Era, Xinjiang, China[M]. Urumqi: Xinjiang People’s Publishing House, 1994. [何国琦,李茂松,刘德权,等. 中国新疆古生代地壳演化及成矿[M]. 乌鲁木齐:新疆人民出版社,1994.]
[13]Zhang Qi, Zhou Guoqing. Ophiolites of China[M]. Beijing: Science Press, 2001. [张旗,周国庆. 中国蛇绿岩[M]. 北京:科学出版社,2001.]
[14]Wang Jingbin, Xu Xin. Post-collisional tectonic evolution and metallogenesis in Northern Xinjiang, China[J]. Acta Geologica Sinica, 2006, 80(1): 23-31.[王京彬,徐新. 新疆北部后碰撞构造演化与成矿[J]. 地质学报,2006,80(1):23-31.]
[15]Xiao W J, Windley B F, Yuan C, et al. Paleozoic multiple subduction-accretion processes of the southern Altaids[J]. American Journal of Science, 2009, 309: 221-270.
[16]Dong Lianhui, Zhu Zhixin, Qu Xun, et al. Spatial distribution, geological features and latest research progress of the main ophiolite zones in Xinjiang, NW-China[J]. Acta Petrologica Sinica, 2010, 26(10): 2 894-2 904.[董连慧,朱志新,屈迅,等.新疆蛇绿岩带的分布、特征及研究新进展[J]. 岩石学报,2010,26(10):2 894-2 904.]
[17]Cao Ronglong. The ophiolite of North Xinjiang and its basic-ultrabasic complex[J]. Xinjiang Geology, 1994, 12 (1): 25-31.[曹荣龙. 新疆北部蛇绿岩及基性超基性杂岩[J]. 新疆地质,1994,12(1):25-31.]
[18]Le Martie R W, Bateman P, Dudek A, et al. A Classification of Igneous Rocks and Glossary of Terms[M]. Oxford: Blackwell Scientific, 1989.
[19]Winchester J A , Floyd P A. Geochemical discrimination of different magma series and their differentiation products using immobile elements[J]. Chemical Geology,1977, 20: 325-343.
[20]Boynton W V. Cosmochemistry of the rare Earth elements: Meteorite studies[C]∥Henderson P ed. Rare Earth Elements Geochemistry. Amsterdam: Elsevier, 1984: 63-114.
[21]Sun S S ,McDonough W F. Chemical and isotopic systematics of oceanic basalts: Implications for mantle composition and processes[C]∥Saunders A D, Norry M J, eds. Magmatism in the Ocean Basins. London: Geological Society Special Publication 42, 1989: 313-345.
[22]Pearce J A. Trace element characteristics of lavas from destructive plate boundaries[M]∥Thorpe R S ed. Andesits. Chichester: Wiley, 1982: 525-548.
[23]Glassiey W. Geochemistry and tectonics of Crescent volcanic rocks, Olympic Peninsula[J]. Geological Society of America Bulletin, 1974, 85: 785-794.
[24]Li Shuguang. Ba-Nb-Th-La diagrams used to identify tectonic environments of ophiolite[J]. Acta Petrologica Sinica, 1993, 9(2): 146-157.[李曙光. 蛇绿岩生成构造环境的Ba-Th-Nb-La判别图[J]. 岩石学报,1993,9(2): 146-157.]
[25]He Guoqi, Han Baofu, Yue Yongjun, et al. Tectonic division and crustal evolution of Altay Orogenic Belt in China[C]∥Geoscience of Xinjiang.Beijing: Geological Publishing House, 1990: 9-20.[何国琦, 韩宝福, 岳永君,等. 中国阿尔泰造山带的构造分区和地壳演化[C]∥新疆地质科学(第2辑).北京:地质出版社, 1990:9-20.]
[26]Chen Zhefu, Xu Xin, Liang Yunhai. The basic features of the accordion-style opening-closing evolution of structures in Xinjiang[J].Regional Geology of China,1993,12(1): 45-58. [陈哲夫,徐新,梁云海. 新疆构造手风琴式开合演化的基本特征[J]. 中国区域地质,1993,12(1):45-58.]
[27]Shu Liangshu, Lu Huafu, Yin Donghao, et al. Late Paleozoic continental accretionary tectonics in northern Xinjiang[J].Xinjiang Geology, 2001, 19 (1): 59-63.[舒良树,卢华复,印栋浩,等. 新疆北部古生代大陆增生构造[J]. 新疆地质,2001,19(1):59-63.]
[28]Xiao Wenjiao, Windley B F, Yan Quanren, et al. SHRIMP zircon age of the Aermantai ophiolite in the North Xinjiang, China and its tectonic implications[J]. Acta Geologica Sinica, 2006, 80(1): 32-37.[肖文交,Windley B F,闫全人,等. 北疆地区阿尔曼太蛇绿岩锆石SHRIMP年龄及其大地构造意义[J]. 地质学报,2006,80(1):32-37.]
[29]Ruzhentsev S V, Pospelov II. The southern Mongolian Variscan fold system[J]. Geotectonics, 1992, 26: 383-395.
[30]Ruzhentsev S V, Mossakovskiy A A. Geodynamics and tectonic evolution of the Central Asian Paleozoic structures as the result of the interaction between the Pacific and Indo-Alantic segments of the Earth[J]. Geotectonics, 1996, 29: 294-311.
[31]Iwata K, Obut O T, Buslov M M. Devonian and Lower Caboniferous radiolaria from the Chara ophiolite belt, East Kazakhstan[J]. News of Osaka Micropaleontologist, 1996, 10: 27-32.
[32]Safonova I Y, Simonov V A, Obut O T, et al. Late Paleozoic oceanic plate stratigraphy hosted by the Char suture-shear zone, East Kazakhstan: Evidence from sediments and volcanic rocks[J].Journal of Asian Earth Sciences, 2012, doi: 0.1016/j.jseaes.2011.11. 015.
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