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Zircon geochronology and geochemistry of mafic xenoliths from Liaoning kimberlites:Track the early evolution of the lower crust,North China craton

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Science China Earth Sciences 2004年第11期47卷 961-972页

作者： ZHENG Jianping1,YU Chunmei1,LU Fengxiang1 & LI Huimin2 1.Faculty of Earth Sciences,China University of Geosciences,Wuhan 430074,China 2.Tianjin Institute of Geology and Mineral Resources,Tianjin 300170,China Faculty of Earth Sciences China University of Geosciences Wuhan China Tianjin Institute of Geology and Mineral Resources Tianjin China

Mafic xenoliths from Paleozoic Fuxian kimberlites (Liaoning Province) mainly in- clude garnet granulite, with minor pyroxene amphibolite, meta-gabbro and pyroxene syenite. The SiO2 contents of the xenoliths are from 47.3 wt% to 49.9 wt%. The granulites are mainly coarse-medium grained and reasonably with well-developed granoblastic (mostly polygonal) texture, contain the assemblage of garnet + plagioclase + pyroxene + K-feldspar ±phlogopite. The mineral assemblage of the amphibolites is plagioclase + pyroxene + amphibole ±K-feldspar, with the equilibrium temperature and pressure conditions of 744—821℃ and 0.76—0.88 GPa. The granulites are regarded as derivation from the lower crust depth (more than 29 km), below the amphibolites. Garnet granulites compositionally correspond to sub-alkalic basalt, and have wide ranges of Ni abundance (133—840 ppm), and Nb/Y (0.12—1.85), Nb/U (3.51—53.86) and Ta/U (0.38—2.48). The amphibolite and the syenite correspond to alkalic basalt. The Fuxian ma- fic xenoliths are regarded as the metamorphic product of the underplated magmas (including fractional crystallization or not) experienced the contamination with the pre-existed crustal com- ponents, and partly effected by kimberlitic magmas. The concordant ages of zircons for the gab- bro (2610—2580 Ma) and the near-concordant upper intercept ages of zircons for the garnet granulite and pyroxene amphibolite (2578—2538 Ma) indicate that they are currently known as the oldest deep-seated xenoliths from the lower crust of the North China craton. These ages recorded the formation of the united Eastern Block of the North China craton. That is, Neoar- chean (2.6—2.5 Ga) is an important continental crustal growth period of the North China craton. The lower intercept age of the garnet granulite (1853 Ma) recorded an important tectonic thermal event in Paleoproterozoic. This event was probably related to collision of the East and West block, and resulted in the final assembly of the North China

关键词： mafic xenolith, petrochemistry, zircon geochronology, petrogenesis, lower crustal evolution, North China craton.

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Retrograded eclogites in the Archaean North China craton.and their geological implication

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Chinese Science Bulletin 1996年第4期41卷 315-320页

作者：翟明国郭敬辉李江海李永刚阎月华张雯华 Institute of Geology Chinese Academy of Sciences Beijing 100029 China Department of Geology Pcking UniversityBeijing 100871

High-pressure metamorphic eclogite, as a window of study for depth level of lowermost crust and mantle, has an important indicating significance to composition, property and accretion of continental lower crust. Archaean high-pressure metamorphic rocks of eclogite facies are very rare. According to this fact, it is suggested that there is a difference in principle between the mechanisms of formation and evolution of early Precambrian and Phanerozoic continental crust. Smelov and Beryozkin first reported that some

关键词： retrograded eclogite Archaean North China craton.

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Sm-Nd age dating of high-pressure granulites and amphi-bolite from Sanggan area,North China craton

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Chinese Science Bulletin 2001年第2期46卷 106-111页

作者： Jinghui Guo Mingguo Zhai Chinese Acad Sci Inst Geol & Geophys Beijing 100029 Peoples R China

The high pressure (HP) metamorphic age has been dated to HP rocks from the Sanggan area, North China craton. We have got garnet+whole rock isochron ages of (1 842±38) Ma for HP granulite, and (1 856± 26) Ma for HP amphibolite. The Sm-Nd whole rock isochron of HP granulites give out an age of (1870±150) Ma with Nd depleted mantle model age of (2402-2 482) Ma. Considering the Nd isotope homogenization during the peak metamorphism of the HP granulite, Sm-Nd closure temperature and the retention of Nd isotopic memory in garnets partially broken down during decompression, all these isochron ages are thought to be HP metamorphic age. Furthermore, we proposed that the HP metamorphism took place at the end of Paleoproterozoic during the large-scale collision and assembly of the North China craton.

关键词： Sm-Nd dating high pressure granulite Paleoproteroz-oic collision North China craton.

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U-Pb SINGLE ZIRCON AGES FOR THE EARLY PROTEROZOIC GRANITE AND PEGMATITE IN SOUTHWEST ZHEJIANG PROVINCE

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Chinese Science Bulletin 1992年第18期37卷 1554-1556页

作者：胡雄健许金坤陈程华李春忠李惠民 The Seventh Geological Team of Zhejiang Province Lishui 323000 PRC Tianjin Institute of Geology and Mineral Resources CAGS Tianjin 300170 PRC

U-Pb single zircon dating confirms the presence of the early Proterozoic metamorphic and deformed granitic intrusive bodies firstly found by Hu Xiong-jian et al. in the Longquan area of southwest Zhejiang Province.

关键词： early Proterozoic granite U-Pb single zircon age Zhejiang-Fujian craton.

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The low-velocity plume on the southwestern edge of Yangtze craton.and superlarge ore deposits

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Science China Earth Sciences 1998年第S1期41卷 47-53页

作者：边千韬李涤徽

A map showing the three dimensional velocity anomaly on the southwestern edge of Yangtze craton.is first compiled. Based on the map, it is suggested that there is a low velocity plume on the edge of Yangtze craton. The low velocity plume is the effect of mantle plume, plays an important role in controlling the upwelling of asthenosphere, mantle rise and the formation of intracrustal low velocity lens, and is also the carrier and provider of vast amount of fluids, mineralizers, minerogenetic materials and energy. Therefore, it is concluded that the low velocity plume is closely related to Mesozoic and Cenozoic superlarge ore deposits in time and space and genesis.

关键词： low velocity plume mantle plume superlarge ore deposit southwestern edge of Yangtze craton.

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Nitrogen isotope and content record of Mesozoic orogenic gold deposits surrounding the North China craton

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Science China Earth Sciences 2003年第3期46卷 231-245页

作者：毛景文张作衡王义天贾叶飞 Robert Kerrich Faculty of Earth Sciences and Resources China University of Geosciences Beijing 100083 China Institute of Mineral Deposits Chinese Academy of Geological Sciences Beijing 100037 China

As an effective tracer, nitrogen isotopes have been used to determine the source of ore materials in recent years. In this study, the nitrogen isotopes and contents were measured on K- feldspar and sericite of gold deposits and some related granitic intrusions in Jiaodong, Xiao-qinling-Xiong抏rshan, west Qinling, the west part of North Qilian and the Zhangjiakou-Xuanhua district around the North China craton.(NCC). Although the gold deposits around the NCC are hosted in Precambrian metamorphic rocks, Phanerozoic sedimentary rocks, mafic volcanic rocks or granite, comparison of which with the nitrogen contents and isotope data of previous studies on mantle-derived rocks, granites, metamorphic rocks and gold deposits indicates that those deposits are closely related to granitic rocks. In addition, mantle-derived materials may have been involved in the ore-forming processes to a certain degree. This conclusion is consistent with the result of previous hydrogen, oxygen and carbon isotopic studies of those gold deposits.

关键词： nitrogen isotope, nitrogen content, gold deposit, margins of the North China craton.

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