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     

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     

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     

现代热液喷口系统低温氧化物沉积体的矿物学特征及启示

Fe-Si氧化物是现代洋底热液系统最为普遍的沉积产物之一,它可以构成低温烟囱体、形成氧化物丘、充填围岩裂隙,或者以无规则沉积体出现(Hekinian et al.,1993),也可以在弥散流区形成更大规模的多金属沉积物(Hrischeva et al.,2007;     

Paleoenvironments Recorded in a New-Type Ferromanganese Crust from the East Philippine Sea

INTRODUCTIONHydrogenetic marine ferromanganese crusts havereceived much attention over the past several dec-ades ,not only as potential mineral resources enrichedin Mn,Co ,Cu, Ni ,and Pt ( Manhei m,1986) but al-so as potential paleoceanographic records during theirgrowth ( Banakar et al ., 2003 ; Mc Murtry et al .,1994 ; Hein et al .,1992) .Former research has demonstrated that varia-tions in the chemical composition of seamount ferro-manganese crusts canreflect theinfluence of changin…     

大洋新鲜玄武岩中次生组分去除实验研究

<正>由于长期暴露于海底,大洋玄武岩多与海水发生了不同程度的反应,使得海底玄武岩中普遍沉淀了碳酸盐矿物、磷酸盐矿物、粘土矿物、铁锰氧化物等多种次生组分(Staudigel et al.,1983;Furnes et al.,1999;Bu et al.,2008)。次生组分的沉淀,改变了海底玄武岩的原生矿物组合、元素含量及同位素比值特征。从而海底玄武岩中次生     

Carbon Isotope Reversals of Changning-Weiyuan Region Shale Gas, Sichuan Basin

<正>1 Introduction Many high yield shale gas areas in the World are discovered carbon isotope reversals:Barnett,Fayetteville(Zumberge et al.,2012),Marcellus(Tilley et al.,2013),Haynesville(Ferworn et al.,2008),Albany shale gas(Gao et al.,2014),Utica shale gas(Xia et al.,1999;Xia et al.,2012;Xia et al.,2013),the Foothills(Tilley et al.,2011),     

A Modified Transformed Soil Adjusted Vegetation Index for Cropland in Jilin Province,China

正1 Introduction Vegetation indices (VIs) derived from satellite observations are an essential source of information for operational monitoring of the Earth's vegetation (Qu et al.,2018;Yan et al.,2008).However,soil background dramatically affects the performances ofⅥs (Baret and Guyot,1991;Gilabert et al.,2002;Huete,1988;Qi et al.,1994).So soil-adjustedⅥs (Baret and Guyot,1991;Gilabert et al.,2002;Huete,1988;Qi et al.,1994) are     

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),     

江西德兴地区中侏罗世斑岩铜成矿系统、冷却、剥蚀历史:来自同位素年代学和低温热年代学的制约

<正>目前,对于斑岩铜矿的研究主要集中于探讨温度区间为200⁸00℃范围内矿床的成因问题,例如岩体形成时代及顺序、矿化和热液蚀变时代以及热液活动时限等(Barra et al.,2002;Masterman et al.,2004;Deckart et al.,2005;Pollard et al.,2005;Campbell et al.,2006;Mao et al.,2006;Baumgartner et al.,2009;Redmond and Einaudi,2010;Sillitoe and Mortensen,2010;Vry et al.,2010;Shen et al.,2012;Zhu et al.,2012)。虽然这些问题很重要,但是仍然不足以全面的认识和     

北祁连的形成与演化历史:来自河流沉积物地球学 及其碎屑锆石U-Pb年龄、Hf同位素组成的证据

<正>河流沉积物中碎屑锆石U-Pb定年与Hf同位素分析相结合可获得所研究区域地壳的形成、演化的丰富信息,细粒沉积物是对流经源区的地壳进行均匀采样的理想工具(Taylor et al.,1985、1995;Mc Lennan.,2001;Rudnick et al.,2004;Bodet et al.,2000;Luo et al.,2008;陈岳龙等,2014)。在北祁连造山带中,发源于西北端的北大河,     

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     

Effect of Phosphatization on Element Concentration of Cobalt-Rich Ferromanganese Crusts

1 Introduction Co-rich ferromanganese crusts occurring on submarine guyots have received much attention from scientists since the beginning of the 1980’s because they are enriched in Co, Mn, Pt, and rare earth elements (REEs), and have large potential mineral resources, occurring as they do on topographic highs relative to polymetallic nodules in the C-C (Clarion-Clipperton) zone (Halbach et al., 1982, 1989; Hein et al., 1992, 1999; Usui and Someya, 1997; Yamazaki and Sharma, 1998, 2000…     

西藏冈底斯岩基晚白垩纪拆沉作用

<正>冈底斯岩基是拉萨地体的重要组成部分,广泛发育早古生代至新生代岩浆岩(Chung et al.,2003;Hou et al.,2004;Mo et al.,2007;Wen et al.,2008;Zhu et al.,2011,2012)。在冈底斯岩基漫长而复杂的演化过程中伴随着大量的岩浆活动,其中200~150Ma、140~80 Ma、65~41Ma以及35-14Ma被认为是     

http://www.sciencedirect.com/science/article/pii/S167498711400156X

<正>Continental reconstructions in Central Asia are represented by orogenesis along some large orogenic belts in the Altaid collage(Fig.1)or Central Asian Orogenic Belt(CAOB),which separate the East European and Siberian cratons to the north from the Tarim and North China cratons to the south(Sengor et al.,1993;Jahn et al.,2004;Windley et al.,2007;Qu et al.,2008;     

桂林茅茅头大岩现代碳酸盐沉积物210Pb分布特征

<正>~(210)Pb技术已经广泛应用到冰芯(Kehrwald et al.,2008)、海洋(Sternberg et al.,1979)和湖泊沉积物(Wu Yanhong et al.,2010)、以及洞穴沉积物(Baskaran et al.,1993)定年研究中。不同于其他地质载体,洞穴沉积物接受的外界~(210)Pb输入,却隔着洞穴顶板、岩溶含水层、土壤和植被等,在这个特殊的背景下,洞穴沉积物中~(210)Pb将表现出什么     

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.     

Oceanic Island Basalts from the Darbut and Karamay Ophiolitic Mélange in West Junggar(NW China): Product of a Middle Devonian Mantle Plume?

<正>The Central Asian Orogenic Belt(CAOB)is an immense accretionary orogen and is an important site of Phanerozoic crustal growth(Fig.1a;Seng?r et al.,1993;Jahn,2004;Windley et al.,2007;Xiao et al.,2008;Safonova and Santosh,2014).The West Junggar,situated     

现代海底热液流体和硫化物Fe同位素组成特征及其地质意义

<正>非传统稳定同位素体系地球化学及其应用近十多年来得到了快速发展,特别是低分辨率下Fe同位素的MC-ICP-MS高精度测试技术使得Fe同位素在地球科学领域得到广泛应用(Belshaw et al.,2000;Zhu et al.,2002;朱祥坤等,2013)。前人对地球上不同储库的Fe同位素组成进行了大量研究,     

中印度洋脊Edmond热液区多金属硫化物中超显微金银矿物的发现及其成矿意义

<正>迄今为止,前人已在位于大洋中脊、海山以及弧后盆地热液活动区的部分块状硫化物矿床中发现有大量自然金、银金矿和自然银产出(Hannington et al.,1986,1991,1995;Herzig et al.,1993;Murphy&Meyer,1998;Moss&Scott,2001;Petersen et al.,2002)。但总体而言,Au-Ag系列独立矿物在大多数沿快速-中速扩张洋脊分布、以MORB为容矿基岩的多金属硫化物矿床中