布拜图对热液氧化物沉淀条件的指示

<正>无定形Fe-和Mn-羟基氧化物以及硅的沉积体广泛分布于洋中脊(Dekov et al.,2010)、弧后盆地(Hein et al.,2008;Zeng et al.,2012)和海山(Emerson et al.,2002;Edwards et al.,2011)等不同地质背景的海底热液区。热液Fe-羟基氧化物按成因可以分为三类:热液硫化物的氧化产物,直接从热液中沉淀形成的氧化物以及来自热液     

豫西卢氏八宝山铁铜多金属矿床黄铁矿成分研究

<正>东秦岭地区不仅是我国世界级钼矿的聚集区也是一个重要的金矿和多金属矿聚集区(Mao et al.,2011)。这些矿床主要形成在235¹10Ma,且在过去的十年间得到了众多学者的大量研究(Stein et al.,1997;Mao et al.,2002,2011;李永峰等,2005;叶会寿等,2006;Zhang et al.,2007,2011;Chen et al.,2008,2009;Zhu et al.,2009;Xu et al.,2010;     

山东莱芜小官庄铁矿床表生氧化过程中的铜同位素分馏及其找矿意义

<正>近年来,铜同位素的研究及其地质应用取得了重要进展(Maréchal et al.,1999;Zhu et al.,2000;Mathur et al.,2005;Markl et al.,2006;Pokrovsky et al.,2008;Maher et al.,2011;Dekov et al.,2013;Mathur and Fantle,2015),     

Mud-Shale Gas Forming Conditions in Carboniferous and Strategic Area Selection in Qaidam Basin

<正>Exploration at home and abroad have proved that oil and gas preserved in mud-shale reservoir is frontier for oil industry,marine mud-shale in America and marine/terrestrial mud-shale in China both exhibited good potential(Zhang et al.,2008;Nie et al.,2009;Li et al.,2010;Dong et al.,2011;Jiang et al.,2012).Although study on shale gas started late in China with many topics     

扬子地块中元古代基性岩体群成因及其成矿作用——以四川会理竹箐基性岩体群为例

<正>在中国,钒钛磁铁矿主要产在约260 Ma的峨眉山大火成岩省内(Zhou et al.,2005),竹箐岩体群虽然位于扬子地台西缘的ELIP的内带范围内,但与晚古生代形成ELIP的岩浆活动无关。有人提出扬子地台很可能参与了Columbia超大陆的聚合过程(Zhang et al.,2006;Sun et al.,2008;Wu et al.,2008;Zhao et al.,2010),然而,关于扬子地块与Columbia超大陆之间关系的研     

Re-Os同位素体系在沥青及灰岩中的应用研究——以青海玉树地区东莫扎抓铅锌矿为例

Re-Os同位素体系作为富有机质地质样品定年和示踪的一种强有力工具,得到了国内外地质学家的广泛认可(Ravizza and Turekian,1989;Cohenet al.,1999;Jiang et al.,2007;Selby et al.,2005;Yang et al.,2004;Hannah et al.,2006)。黑色页岩等样品由于有机质含量较高,与有机质存在紧密联     

Nd-Sr Isotopic Geochemistry of the Late Archean-Paleoproterozoic Granitoids in the Lüliang-Wutai Terrain,North China Craton,and Implications for Petrogenesis

1 Introduction The tectono-thermal evolution of the North China Craton (NCC) in Late Archean to Paleoproterozoic times has long been attractive to many researchers (Wan et al., 2000; Zhao et al., 2000, 2002; Guo et al., 2001; Liu et al., 2002; Zhai and Liu 2003; Zhai, 2004; Yu et al., 2004; Kr?ner et al., 2005; Wilde et al., 2005). Zhao et al. (2000, 2002) proposed a tectono-thermo framework for the evolution of the NCCbased on detailed petrological and geochronological data, and they …     

PACMANUS热液区Si-Fe-Mn氧化物的Sr、Nd、Pb同位素特征及其对热液活动的指示

<正>无定形Fe和Mn氧化物以及硅的沉积体广泛分布于洋中脊、弧后盆地和海山等不同地质背景的海底热液区(Binns et al.,1993;Hein et al.,2008;Dekov et al.,2010)。Fe-Mn氧化物按照成因不同主要分为三种类型(Hein et al.,2008):(1)从海水中通过加积作用沉淀在坚硬基岩上的水成成因Fe-Mn氧化物;     

东太平洋海隆2°S热液区硫化物He、Ar同位素组成

<正>自东太平洋海隆(EPR)21°N首次发现高温热液喷口(Francheteau et al.,1979;Spiess et al.,1980)以来,沿EPR发现了一系列活动热液喷口和硫化物矿床。大量热液活动调查研究表明不同喷口热液流体化学特征具有很大相似性(Von Damm,1990;Von Damm et al.,1995),例如最早报道的加拉帕格斯裂谷热液流体3He/4He比值具有很好的一致性(Lupton et al.,1977;Jenkins et al.,1978),沉淀形成的硫化物矿     

藏南特提斯喜马拉雅江孜-康马地区早白垩世辉绿岩地球化学特征及其意义

<正>特提斯喜马拉雅带经历了多期基性岩浆作用,形成不同地球化学性质的基性岩(Jiang et al.,2006;江思宏等,2007;Zhu et al.,2009;曾令森等,2012;Zeng et al.,2012)。这些基性岩主要以岩墙群或岩席的形式侵入到不同时代的特提斯沉积岩系中,厘定这些基性岩的形成时代、地球化学特征和代表的构     

慢速洋中脊超基性岩热液区热液产物特征

<正>慢速洋中脊离轴区高温热液对流系统主要建立在超基性岩基础上,其成矿流体为碱性还原性流体(Bach et al.,2010),流体组分很大程度上取决于高温海水与超基性岩的水-岩反应,该类热液区上的块状硫化物因此表现出相对特殊的矿物组成和化学成分(Klevenz et al.,2011)。我们对Rainbow区(Lein et al.,2003)、Logatchev(Gablina et al.,2000)、Ashadze(Mozgova et al.,2008)等离轴区热液喷口流体     

On the Systematic Position of Eosipterus yangi Ji et Ji, 1997 among Pterodactyloids

1 Introduction Eosipterus yangi is the first pterosaur found from western Liaoning Province (Ji and Ji, 1997). Since then, more and more pterosaurs have been reported (Ji and Ji, 1998; Wang and Lü, 2001; Wang et al., 2002, 2005; Wang and Zhou, 2003, 2004; Lü, 2003; Ji et al., 2004; Lü and Ji, 2005a, b; Dong and Lü, 2005; Lü and Yuan, 2005; Lü and Zhang, 2005; Lü et al., 2006). Because Eosipterus yangi lacks skull, it is difficult to resolve its relationships to other pterodact…     

A Preliminary Report on Yong''''anpu Tectonic Window in Suizhong County, Western Liaoning Province

Several thrust faults have been mapped in theYanshan belt ,as the thrust structure was first iden-tified by Wong (1928) (Ji et al .,2005 ; Wang et al .,2005a ;Davis et al .,2001 ,1998 ; Yang et al .,2001 ;Zheng et al ., 2000 ; Chen, 1998 ; Zhang et al .,1986 ; He ,1957 ;Chern and Hsiung,1935) .Becausethe Archean basement was widely involved in thethrust systemof the Yanshan belt ,domestic popularrecognition emphasized the thick-skinned characteris-tics and li mited horizontal displacement…     

Modeling the Asian Aridity during the Early Cenozoic

正Asian aridity can be traced back to the early Cenozoic (e.g.,Guo et al.,2008;Licht et al.,2016;Li et al.,2018a).Previous modelling studies focus mainly on the monsoon climate during the early Cenozoic,and studies for the Asian aridity are still limited (e.g.,Huber and Goldner,2012;Zhang et al.,2012;Li et al.,2018b).Here Asian aridity during the early Cenozoic is investigated through climate modelling by changing atmospheric CO_2 concentration,orbital parameters,and topography.     

川西盐边地区镁铁质岩墙的年代学和地球化学特征

前人对新元古代镁铁质岩墙的研究对于重建Rodinia超大陆的裂解在澳大利亚和华南中的表现起到至关重要的作用(Wingate et al.,1998,2000;Li Z X et al.,1999;Li X H et al.,2006b).     

变质脱水过程中Au、Cu、Pb、Zn的萃取及其对造山型成矿作用的启示

<正>造山型金矿为世界上最重要的金矿类型,被认为是变质流体成矿的典型代表(Goldfarb et al.,2005)。此外,变质地体中部分贱金属矿床(Cu、Pb、Zn)具有与造山型金矿类似的地质和地球化学特征,也被认为形成于变质流体(如Leach et al.,1998;Zhong et al.,2012,2013),部分学者亦将其命名为造山型矿床(陈衍景,2006)。目前     

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).     

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.,     

华北克拉通东南缘约1.8 Ga高压麻粒岩相变质作用:岩石学和锆石U-Pb年代学证据

华北克拉通北邻中亚造山带,南接秦岭-大别-苏鲁造山带.它通常被认为是约18亿年固结形成的陆块.其基底的形成与演化,一直受到广泛关注(Zhao et al.,1998,2000,2005;Zhai et al.,2000,2005;Wilde et al.,2002,2005;Guo et al.,2005;Kroner et al.,2005,2006;Lu et al.,2008).大多数研究者都注重于华北克拉通内部、北部和东西陆块结合带(中间带),较少关注东南缘基底的形成与演化研究.     

Report on 34 Ga SHRIMP Zircon Age from the Yuntaishan Geopark in Jiaozuo, Henan Province

1 Introduction According to recent researches, the North China Craton consists of three parts: the eastern block, western block and central zone (Zhao, 2001; Wilde et al., 2002). Paleoarchean continental blocks and zircon residuals have only been found in a few regions, such as Anshan, East Liaoning (Liu et al., 1992; Song et al., 1996; Wan et al., 2002, 2005), Caozhuang, East Hebei (Liu et al., 1992) and Xinyang, West Henan (Zheng et al., 2004), which are mainly distributed in the east…