Crustal Structure and Chemical Composition of the Dabie Orogenic Belt

1. IntroductionRegional geochemistry is becoming an effective means to reveal regional crustal evolution. Many researchers have explored the evolution of continental lithosphere, crust-mantle interaction and mineralization setting by studying the structure and composition of the continental crust over various regions (Weaver and Tarney, 1984; Taylor and Mclennan, 1985; Shaw et al., 1986; Li et al., 1990; Gao et al., 1990; Zhang et al., 1994). The Qinling-Dabie Orogenic Belt, which travers…     

Research advance in sediment provenance of the Qiongdongnan Basin

<正>1 Introduction Sediment provenance study,as an important part of basin analysis,is a key for source area definition,paleogeographic reconstruction,sediment transport route identification,and tectonic evolution(Haughton et al.,1991;Morton et al.,1999;Fontanelli et al.,2009;Cawood et al.,2012).The Qiongdongnan Basin(QDNB),lies in the northwestern passive continental margin of the South     

A New Discovery of Cretaceous (~125 Ma) Migmatite in Liaodong Peninsula, North China Craton

正Objective The North China Craton (NCC),especially its eastern region,had experienced extensive lithospheric thinning during the Mesozoic (Zhu et al.,2011).The Liaodong Peninsula is an important constituent of the eastern NCC,and has recorded intensive lithospheric thinning-related magmatism and extensional deformation (e.g.,metamorphic core complex;Zheng et al.,2018).Previous     

Exploration and Realization of Several Key Problems of Geological Big Data

正With the rapid development of technology,geological big data is increasing explosively,and plays an increasingly important position in the national economy (Zhang and Zhou,2017;Zhou et al.,2018).Governments and agencies attach great importance to the open internet service of geological big data and information at home,and abroad (Yan et al.,2013;Guo et al.,2014).The basic norms of western countries'geological data information services are rich and varied products,efficient and     

Metallogenetic Mechanism and Timing of Late Superimposing Fluid Mineralization in the Dongguashan Diplogenetic Stratified Copper Deposit,Anhui Province

1 Introduction The region of the middle-lower reach of the Yangtze River is an important mineralized belt of Fe, Cu, Au, S and other elements, with a series of sedimentary-hydrothermal diplogenetic mineral deposits (Xu and Zhu, 1978; Liu et al., 1984; Gu and Xu, 1986; Gu et al., 1993, 2000; Zhai et al., 1992). Some geologists thought that the Carboniferous massive sulfide exhalative sediment was the basis of the late diplogenetic mineralization (Gu and Xu, 1986; Gu et al., 1993, 2000); o…     

New Discovery of the Devonian Orthoclase Granite of Nenjiang–Heihe Structural belt, China and its Zircon U-Pb Data

正Objective The Nenjiang–Heihe structural belt is located in the eastern Xing’anling Mongolian Orogenic Belt between the Songnen block and Xiang’an block.This structural belt has long been the focus of geological scholars(Miao Laicheng et al.,2003;Liang Chenyue et al.,2011;Li Chao et al.,2017),which has complex geological condition,     

Metallogenic Regularity of Hydrothermal Uranium Deposits in the Migmatite of the Kangdian Axis

<正>1 Introduction The Kangdian axis is an important polymetallic metallogenic belt in Southwest China,and it is also an area with a lot of hydrothermal uranium mineralization(Wang Hongjun,et al.,2009.The basic     

GEOCHEMISTRY OF VOLCANIC ROCKS FROM WULIBA IN THE MIANLUE SUTURE ZONE, SOUTHERN QINLING

1. IntroductionThe Mianlue (Mianxian-Lueyang) suture zone is one of the components of the Qinling orogenic belt and the latest major suture zone between North and South China. The data available suggest that it is a complicated ophiolitic tectonic melange zone including many tectonic slabs of different origins (Zhang et al., 1995; Lai et al., 1996; Lai et al.,1997; Lai et al.,1998; Xu et al.,1996). Up to now, however, there is not definite evidence of volcanic rock assemblage and geochemi…     

A Combined-Power Model for the Distribution of Axial Force in Shaft Anchor along Its Length

INTRODUCTIONThe anchorage of geomaterial , including shaftanchors and prestressed tendons ,is usually used ingeotechnical engineering. Owing to various advanta-ges ,these two anchorage types are widely used instructures in China ( Cao et al ., 2003 ; Fu et al .,1999 ;Lu et al .,1998 ; Li et al .,1995) . Shaft an-chors can be classifiedinto three kinds by the forceinthe shaft and cement grout :tensile ,press ,and sheartype (Lu et al .,1998) . The tensile type is the mostpopular in China…     

Multiple Stratigraphy Study of the Ordovicianin SW Ordos,China

正The Ordovician (485.4 Ma-443.8Ma) is the longest period of the Paleozoic,which was characterized by a peak of greenhouse climate in Earth history,as well as extreme high sea level (Haq and Schutter,2008;Munnecke et al.,2010),with warm and humid conditions in early-middle period and seawater temperature up to 45℃(Trotter et al.,2008).The carbon cycle fluctuated greatly (Melchin et al.,2013;Cramer et al.,2015) and     

~(40)Ar-~(39)Ar Age and Geological Significance of the Sawur Gold Belt in Northern Xinjiang, China

1 IntroductionThe Sawur gold belt is an eastward extending section ofthe Zarma-Sawur gold-copper belt in Kazakhstan, locatedin the Sawur Mountain, northern Xinjiang, and mainlycomprises two large- to medium-sized gold deposits,accompanied by five small gold deposits and a series ofgold ore spots (Yin et al., 1996, 2003; Wang et al., 1999; Liet al., 2000; Liu et al., 2003; Shen et al., 2004a). TheKuo'erzhenkuola and Bu'erkesidai gold deposits are thebiggest and most important ones in this …     

The First Discovery of a Large Sandstone-type Uranium Deposit in Aeolian Depositional Environment

正The exploration depth of sandstone-type uranium deposits worldwide is mostly less than 700 m, and most of them occur in strata of fluvial facies(Adams et al., 1981; Jin et al., 2016; Hou et al., 2017). Only a few small uranium deposits have been reported in aeolian depositional environments(Isachsen et al., 1955; Li et al.,     

http://www.sciencedirect.com/science/article/pii/S1674987112000874

<正>1.Introduction The continental crust,covering nearly a third of the Earth's surface,is dominantly made up of granites and granodiorites(Rudnick and Gao, 2003).Although the vast majority of these granitoids are amphiboleand /or biotite-bearing,orthopyroxene-bearing granitoids form a minor but important component of the lower continental crust in many high-grade terrains(e.g.,Bohlender et al.,1992;Kilpatrick and Ellis,1992;Sheraton et al.,1992;Berger et al.,1995;Zhou et al., 1995;Peucat et al.,1996;Duchesne and Wilmart,1997;Hughes et al.,1997;Prame.1997;Frost et al.,2000;Janasi,2002;Mendes     

Initial geometry and paleoflow reconstruction of the Yamansu skarn-related iron deposit of eastern Tianshan(China): from paleomagnetic and magnetic fabrics investigations

<正>This study aims to uses paleomagnetic and anisotropy of magnetic susceptibility(AMS)methods to recognize the initial deposit position and to track the paleoflow at the origin of an iron skarn-related deposit.The Yamansu deposit is located in eastern Tianshan(Charvet,2007).This province has a substantial mining potential for Fe–(Cu)skarn,Cu–Ni and V–Ti orthomagmatic deposits,and orogenic Au lodes(Branquet et al.,2012;Zhang et a.,2005;Mao et al.,2005).Recent publication dates the Yamansu deposit at 323 Ma,and uses this deposit to define a model of Submarine Volcanogenic Iron Oxide(SVIO)deposits(Hou et al.,     

Hydrogen and Oxygen Isotopes of Fluid Inclusion in Halite,Northern Shaanxi Salt Basin China

正The Ordovician was an important transitional period for global climate and organic evolution,the global was in the flood and glacial,Onganism was extinction(Zhan,2007;Trotter et al.,2008;Axel et al.,2010).Under the influence     

Ophiolites and Intra-Oceanic Island Arc Assemblages of Eastern Australia, New Caledonia and New Zealand

Throughout the Phanerozoic the eastern margin of Gondwana and related fragments such as New Caledonia and New Zealand that are now dispersed from it grew through the addition of ophiolites and associated intra-oceanic island arc assemblages.Exactly how and why this occurred remains controversial with two main competingmodelsreferredtoaseither‘quantum’or‘accordion’tectonics.The quantum model envisages continental growth through the additional of discrete intra-oceanic assemblages analogous to contemporary tectonic settings in Taiwan,Timor and Papua New Guinea(Aitchison and Buckman,2012).The alternative regards eastern Australia as the type example of a different style of convergent plate margin referred to as an‘extensional accretionary orogeny’(Collins,2002).The oldest Phanerozoic ophiolites and intra-oceanic island arc assemblages are of Cambrian age and are widely reported from the Lachlan Fold Belt in the eastern Australian states of Victoria and NSW(Spaggiari et al.,2003;Greenfield et al.,2011).Similar rocks are also known from Mount Read in Tasmania(Berry and Crawford,1988;Crawford and Berry,1992;Mulder et al.,2016),the Weraerai terrane and its correlatives in the New England orogen further east in northeastern NSW(Aitchison et al.,1994;Aitchison and Ireland,1995)and Queensland,the Takaka terrane in NW Nelson,New Zealand(Münker and Cooper,1999)and the Bowers terrane in Northern Victoria Land,Antarctica(Weaver et al.,1984;Münker and Crawford,2000;Rocchi et al.,2011;Palmeri et al.,2012).The Late Ordovician saw the development of the intra-oceanic Macquarie island arc(Glen et al.,1998;Glen et al.,2007).This system contains important economic mineral deposits.The way in which these arcrocks developed and were juxtaposedagainst a surrounding suite of Lachlan Fold Belt,eastern Australia remains the subject of investigation(see Aitchison and Buckman,2012 for discussion).In a similar area,enigmatic rocks of the Tumut ophiolite also crop out(Graham et al.,1996;Belousova et al.,2015).Further to the east in the New England orogeny Siluro-Devonian rocks of the Gamilaroi terrane and it’s along strike correlatives near Mt Morgan in Queensland represent another intra-oceanic island arc assemblage emplaced onto the Gondwana margin in the Late Devonian(Aitchison and Flood,1994;Offler and Murray,2011).The Late Carboniferous-Permian saw development of significant intra-oceanic island arc and ophiolitic complexes remnants of which crop out in New Zealand,eastern Australia,and New Caledonia.These include the Brook Street terrane(Spandler et al.,2005;Mc Coy-West et al.,2014)and Dun Mountain Ophiolite Belt in New Zealand(Coombs et al.,1976;Stewart et al.,2016),the Gympie terrane in southeast Queensland(Waterhouse and Sivell,1987;Sivell and Waterhouse,1988)and the Koh terrane in New Caledonia(Meffre et al.,1996;Ali and Aitchison,2002).The youngest on-land association of ophiolitic and intra-oceanic island arc rocks in the region is of Eocene age.Ultramafic rocks are well exposed in New Caledonia where they structurally overlie continental rocks of Gondwana margin affinity that,in the northeast of the island,have experienced eclogite facies metamorphism(Aitchison et al.,1995).The emplacement of these rocks was a widespread regional event with potentially correlative rocks exposed in Papua New Guinea(Parrot and Dugas,1980)as well as Northland and East Cape in New Zealand(Whattam et al.,2005;Whattam et al.,2008).     

New Discovery of ~1866 Ma High-temperature Mylonite in the Helanshan Complex: Marking a Late-stage Ductile Shearing in the Khondalite Belt, North China Craton

正Objective The Khondalite Belt is a nearly E–W-trending Paleoproterozoic Himalayan-type orogen in the Western Block of the North China Craton. It is regarded as a result of the collision between the northern Yinshan Block and the southern Ordos Block at ～1.95 Ga, which led to the formation of the united basement of the Western Block(e.g., Zhao et al., 2005; Yin et al., 2011). The Khondalite Belt has undergone long-term continent-continen collisional orogenic processes, and a remarkable series of late-stage orogen-parallel ductile shear zones developed(e.g., Huang et al., 2013; Gong et al., 2014).     

New Discovery of Ca. 38 Ma Ultramafic–mafic Dyke Swarms in the Mitizi Area, Northwestern Tibetan Plateau

正Objective The Tibetan Plateau, located in the eastern part of the Alpine Himalayan tectonic domain, is the youngest and the most spectacular of all continent-continent collisional belts in the world(Zhang et al., 2007; Xu et al., 2011; Zhu et al., 2012).     

GEOCHEMICAL EVIDENCE FOR TWO TYPES OF BASALT IN THE HONGLIUGOU OPHIOLITE MELANGE IN THE ALTYN FAULT BELT, CHINA

The Hongliuguo-Lapeiquan mélange (Fig. 1) is seen in the Altyn fault belt (AFB), which is a large-scale sinistral strike-slip fault belt in the central Asia and also a part of the north natural boundary of the Qinghai-Tibetan plateau, separating the Tarim basin from the Qaidam basin (Zheng Jiandong, 1988; Avouac et al., 1993; Chalaron et al., 1995; Ge Xiaohong et al., 1998; Cui Junwen et al., 1996, 1997, 1999; Wang Yan et al., 1999). This mélange extends eastward from Hongliuguo thro…     

Formation of the Giant Bayan Obo Deposit by ca. 1.3 Ga Carbonatitic Magmatism and its Link with Continental Rifting in the Columbia Supercontinent

正The Bayan Obo in the northern North China Craton is the world’s largest light rare earth element(LREE)deposit and the largest niobium(Nb)and thorium(Th)deposit in China(e.g.,Wu,2008;Kynicky et al.,2012;Ling et al.,