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洋底凸起地质体及其对造山带中蛇绿岩组分的贡献

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岩石学报 2018年第7期34卷 1977-1990页

作者：张继恩陈艺超肖文交陈振宇宋帅华中国科学院地质与地球物理研究所岩石圈演化国家重点实验室北京100029 中国科学院大学北京100049 中国科学院新疆生态与地理研究所矿产资源研究中心乌鲁木齐830011

蛇绿岩作为造山带中保存的曾经存在过的大洋或与大洋有关地质体的残留,除了部分的露头出露有完整的岩石组分之外,研究发现许多露头只出露部分的岩石组分,如只出露第1层的深海/远洋沉积物和第2层的玄武岩或绿岩,且其基性岩以MORB和OIB的... 详细信息

蛇绿岩作为造山带中保存的曾经存在过的大洋或与大洋有关地质体的残留,除了部分的露头出露有完整的岩石组分之外,研究发现许多露头只出露部分的岩石组分,如只出露第1层的深海/远洋沉积物和第2层的玄武岩或绿岩,且其基性岩以MORB和OIB的地球化学特征为主,而不是SSZ型岩浆的地球化学特征。审视以前的蛇绿岩就位模型,学者们认为俯冲洋壳的洋底是平坦的;该假设与现状大洋洋底地形探测资料不吻合。大洋洋底测绘资料显示洋底可以在洋中脊处和海山/洋底高原的位置发育凸起地貌。本文根据岩石破裂的力学性质,分析了它们的破裂过程;结合中国新疆西准噶尔玛依勒地区、日本造山带和美国加州海岸山脉增生楔和蛇绿岩中岩石组合和构造属性,以及它们的就位时代和形成时代年龄差可达几十个百万年到上百个百万年,认为洋底表面的凸起地质体上段部位的岩石容易被滑脱断层错断并卷入到造山带中,而且它们比构造叠置的围岩-海沟沉积物更老。

关键词：蛇绿岩凸起地貌玄武岩硅质岩造山带

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蛇绿岩与蛇绿混杂带结构

地质科学 2021年第2期56卷 560-595页

作者：张继恩陈艺超肖文交闫臻中国科学院地质与地球物理研究所岩石圈国家重点实验室北京100029 中国科学院地球科学研究院北京100029 中国科学院大学北京100049 中国科学院新疆生态与地理研究所乌鲁木齐830011 中国地质科学院地质研究所北京100037

蛇绿岩是刻画造山带洋—陆演化格局的标志性证据,由具有成因联系的超基性—基性岩和上覆远洋—深海沉积物组成,是一种理想剖面,非实际的野外露头表现。蛇绿岩分为MOR型和SSZ型两类,前者形成于洋中脊、洋盆宽度足够的弧前/弧后盆地扩张... 详细信息

蛇绿岩是刻画造山带洋—陆演化格局的标志性证据,由具有成因联系的超基性—基性岩和上覆远洋—深海沉积物组成,是一种理想剖面,非实际的野外露头表现。蛇绿岩分为MOR型和SSZ型两类,前者形成于洋中脊、洋盆宽度足够的弧前/弧后盆地扩张脊环境,后者形成于洋壳初始俯冲阶段的弧前环境。蛇绿岩的形成年龄可以通过古生物和同位素测年方法获得,同位素年龄与最老古生物化石(如放射虫、牙形刺等)年龄相近;洋壳运移过程中,有岩浆击穿洋壳而发育二元结构,由早期洋壳和叠覆的晚期岩浆岩构成;晚期岩浆岩比最老古生物年龄更为年轻。蛇绿岩通过俯冲铲刮、深部底垫和仰冲作用就位,发育褶皱和叠瓦状—双冲构造、及构造肢解为“基质夹岩块”结构成为蛇绿混杂带;蛇绿岩的形成年龄和就位年龄之间可从无年龄差到数十、甚至上百个百万年的时间跨度。蛇绿岩就位后继续经历俯冲带上盘和陆内活化等阶段的演化:蛇绿岩就位时的滑脱断层切穿俯冲带上盘,为后期岩浆提供通道,可侵入多期次的、非蛇绿岩套组份的中基性—酸性岩脉和岩体,包括SSZ型特征的岩浆岩,如新疆扎河坝—和布克赛尔蛇绿混杂带和美国Klamath山蛇绿混杂带。蛇绿混杂带在变质变形强烈的俯冲带上盘和活化的陆内环境中,受到构造改造,造成单一露头区不能够完整地出露有蛇绿岩套的岩石组份,而侵入在蛇绿混杂带中的岩浆岩被构造肢解、形成岩块并使得混杂带内岩石组份复杂化。现今露头的蛇绿混杂带是经历过多阶段演化的、一种现时状态的“四维时空”信息的综合体,即多个时期的物质叠置在同一个露头的三维空间内,一些岩石可能与蛇绿岩套并无成因联系。

关键词：蛇绿岩基性—超基性岩蛇绿混杂带 “基质夹岩块”结构侵入岩

GEOCHRONOLOGIC AND GEOCHEMICAL EVIDENCE FOR PERSISTENCE OF SOUTH-DIPPING SUBDUCTION TO LATE PERMIAN TIME, LANGSHAN AREA, INNER MONGOLIA(CHINA): SIGNIFICANCE FOR TERMINATION OF ACCRETIONARY OROGENESIS IN THE SOUTHERN ALTAIDS

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GEOCHRONOLOGIC AND GEOCHEMICAL EVIDENCE FOR PERSISTENCE OF S...

中国科学院地质与地球物理研究所2014年度（第14届）学术年会

作者： LI’NA LIN wenjiao xiao BO WAN BRIAN F.WINDLEY SONGJIAN AO CHUNMING HAN JIANYUN FENG JI’EN ZHANG ZHIYONG ZHANG State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences Graduate University of Chinese Academy of Sciences Xinjiang Research Center for Mineral Resources Xinjiang Institute of Ecology and GeographyChinese Academy of Sciences Department of Geological Sciences Stockholm University Department of Geology University of Leicester

The Langshan area in Inner Mongolia is situated in the southern Altaids between the Beishan suture to the west and the Solonker suture to the east. This paper addresses the poorly known tectonic evolution that led to formation of the terminal Solonker suture. Dating of deformed porphyries and undeformed dolerites and gabbros constrains the timing of the relevant NE-E-striking and north-vergent deformation. Deformed granitic-granodioritic porphyries in this area are characterized by high Si O2(65.38-78.00%), low TFe2O3(1.29-5.07%), Mg O(0.13-0.63%), and variable K2O(0.53-4.14%) and Na2O(2.05-4.62%). All samples have enriched LREE(La/Yb 6-18)and negative Nb anomalies(Nb N/Th N0.09-0.48), but different Eu anomalies(Eu*<0.7 or 1);these geochemical features can be ascribed to a heterogeneous source in a subduction-related environment. Gabbros and dolerites have 42.33 to 52.03 percent Si O2. All mafic samples have similar La/Yb ratios of 4 to 6 and negative Nb anomalies(Nb N/Th N) ratios of 0.2 to 0.8, suggestive of a subduction-related setting. Two granitic porphyries yielded238U/206 Pb weighted mean ages of 284.7 2.1 Ma with MSWD of1.6 and 291.7 2.1 Ma with MSWD of 1.14;these ages are consistent with235U/207 Pb and238U/206 Pb concordia ages of 281 17 Ma with MSWD of 0.87 and 289.8 9.2 Ma with MSWD of 0.66. A dolerite yielded concordia ages of 256.2 2.6 Ma with MSWD of 0.44 and 256 2.5 Ma with MSWD 0.45. The ages and geochemistry of the deformed porphyries indicate that in the early Permian there was important deformation and recrystallization in a subduction-related setting. The isotopic and geochemical signatures of all the rocks indicate that they formed during subduction-related conditions. We propose that Langshan was a Permian active continental margin arc built on the edge of the North China Craton by southward subduction, which led to closure of the ocean, concomitant formation of the Solonker suture in the late Permian-early Triassic, and termination of the accr

关键词： Langshan Permian accretionary tectonics North China Craton Andean-type arc

Re–Os Isotopic Age of the Hongqiling Cu–Ni Sulfide Deposit in Jilin Province, NE China and its Geological Significance

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Re–Os Isotopic Age of the Hongqiling Cu–Ni Sulfide Deposit...

中国科学院地质与地球物理研究所2014年度（第14届）学术年会

作者： Chunming Han wenjiao xiao Guochun Zhao Benxun Su Songjian Ao Jien Zhang Bo Wan Zhongmei Wang Jiaxin Ding Wenjun Qu Andao Du Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences Department of Earth Sciences The University of Hong Kong National Research Center of Geoanalysis

The Hongqiling Cu–Ni sulfide deposit in central Jilin Province is located in the eastern part of the Central Asian Orogenic Belt. Rhenium and osmium isotopes in sulfide minerals from the deposit are used to determine the timing of mineralization and the source of osmium, and ore metals. Sulfide ore samples have osmium and rhenium concentrations of 0.28–1.07 ppb and 2.39–13.17 ppb, respectively. Ten analyses yield an isochron age of 223 ± 9 Ma, indicating that the Cu–Ni sulfide deposit in the area formed in the Triassic. The initial 187Os/188 Os ratio is around 0.295 ± 0.019(MSWD = 1.14) and the δ34S values of sulfide ores vary from-1.50 to +3.00‰. These data indicate that the mineralizing materials were derived mainly from a mantle with some quantities of crustal components introduced into the rock-forming and ore-forming systems during mineralization and magmatic emplacement.

关键词： Cu–Ni deposit Hongqiling NE China Re–Os isotopic dating

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造山带中缝合面结构特征与构造意义

岩石学报 2021年第8期37卷 2324-2338页

作者：陈艺超张继恩田忠华闫全人侯泉林肖文交中国科学院大学地球与行星科学学院北京100049 中国科学院地质与地球物理研究所岩石圈演化国家重点实验室北京100029 中国地质科学院地质研究所北京100037 中国科学院新疆生态与地理研究所矿产资源研究中心乌鲁木齐830011

缝合带是两个板块之间的分隔带,其规模和形态在不同类型的造山带中多有不同。本文从缝合带和缝合面的定义出发,以典型造山带为案例探讨缝合面的变形及其对造山带结构解析、沉积盆地性质判别的影响。俯冲阶段的主滑脱面是一个没有厚度的... 详细信息

缝合带是两个板块之间的分隔带,其规模和形态在不同类型的造山带中多有不同。本文从缝合带和缝合面的定义出发,以典型造山带为案例探讨缝合面的变形及其对造山带结构解析、沉积盆地性质判别的影响。俯冲阶段的主滑脱面是一个没有厚度的应变带,在碰撞后又作为增生杂岩的底界得以保留。这一界面严格区分了上盘和下盘沉积盆地之间的物源亲缘性,因而将之定义作为缝合面可有效帮助解析造山带不同位置盆地的性质。蛇绿岩带、高压变质岩带和大型断裂等线状要素仅能用以大致限定缝合带的位置,而不能用以精确限定缝合面的位置。不同于俯冲阶段相对平直的主滑脱面,缝合面的形态可以在碰撞过程中、甚至碰撞后被逆冲推覆和走滑所改造。在阿尔卑斯、喜马拉雅、东准噶尔等典型造山带中,缝合面都经历了向着前陆方向的远距离推覆及褶皱变形,这一变形的缝合面经历风化剥蚀过程后,在地表的形态呈复杂的指状交叉的特征,甚至由于飞来峰和构造窗的出现而呈现多个出露点。而在双向俯冲系统中,缝合面天然具有Z型的特征,经历后期变形后其形态会更加复杂。在苏鲁-大别造山带,多期次的后期变形叠加在早期的线状缝合面之上,特别是走滑断裂将包括缝合面在内的造山带切割为不连续的断夹块,极大地改造了缝合面在地表的出露形态。综上,在解析造山带结构,特别是进行沉积大地构造研究时,缝合面的复杂形态必须要得到重视。错误的缝合面位置可能造成错误盆地性质判断。

关键词：缝合面缝合带物源分析沉积大地构造俯冲-碰撞

SIMS U-Pb zircon dating and Re-Os isotopic analysis of the Hulu Cu-Ni deposit,eastern Tianshan,Central Asian Orogenic Belt,and its geological significance

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SIMS U-Pb zircon dating and Re-Os isotopic analysis of the H...

中国科学院地质与地球物理研究所2013年度（第13届）学术年会

作者： Chunming HAN wenjiao xiao Guochun ZHAO Ben-Xun SU Patrick Asamoah SAKYI Songjian AO Bo WAN Ji'en ZHANG Zhiyong ZHANG Institute of Geology and Geophysics Chinese Academy of Sciences Xinjiang Research Center for Mineral Resources Xinjiang Institute of Ecology and GeographyChinese Academy of Sciences Department of Earth Sciences The University of Hong Kong Department of Earth Science University of Ghana

Exploration of the Hulu Cu-Ni-Co sulfi de depo sit in Eastern Tianshan,Central Asian Orogenic Belt,has detected horizons of sulfide mineralization in pyroxenite and peridotite *** U-Pb zircon ages of the gabbro-hosting Cu-Ni-Co sulfide deposit indicate that the HUlu intrusion was emplaced at 282.3±1.2 Ma(95%confidence level,MSWD=3.30, n=13).Osmium isotopic data suggest that the HUlu intrusion and associated Cu-Ni mineralization were derived from crustally-contaminated mantle *** intrusions clearly show island-arc geochemical signatures,such as negative Nb,Ta,Zr and Ti anomalies and enrichment in LILE,These geochemical tracers indicate that the Hulu mafic-ultramafic intrusions,along with the Cu-Ni deposit,formed as a result of subduction of oceanic crust in the Early *** arc-related geodynamic setting of the Hulu Cu-Ni deposit is unusual for magmatic sulfide *** new type of ore deposit offers an alternative perspective for Cu and Ni exploration.

关键词： Hulu Complex SIMS U-Pb zircon Re-Os isotopic data Cu-Ni deposit Eastern Tianshan Central Asian Orogenic Belt

Provenance and tectonic settings of Permian turbidites from the Beishan Mountains,NW China:Implications for the Late Paleozoic accretionary tectonics of the southern Altaids

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Provenance and tectonic settings of Permian turbidites from ...

中国科学院地质与地球物理研究所2012年度（第12届）学术年会

作者： Qianqian Guo wenjiao xiao Brian F.Windley Qigui Mao Chunming Han Junfeng Qu Songjian Ao Jiliang Li Dongfang Song Yong Yong State Key Laboratory of Lithosphenc Evolution Institute of Geology and GeophysicsChinese Academy of Sciences Graduate University of Chinese Academy of Sciences State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences Department of Geology University of Leicester Beijing Institute of Geology for Mineral Resources State Key laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences

The Beishan orogenic belt,which connects the Tianshan suture on the west and Solonker suture on the east,contains key evidence for the termination time of the southern *** for evaluating different controversial tectonic models are Permian marine volcaniclastic arenites in the Liuyuan and Heishankou areas,which are dominated by greywackes and lenticular pebbly litharenites that contain grading,groove marks,and erosional bases,which provide evidence of turbidity *** from the Liuyuan section are dominated by angular basaltic,andesitic,and feldspar fragments,but sandstones from the Heishankou section mainly consist of andesitic and felsic volcanic *** relations suggest derivation from two different *** element compositions suggest that the source rocks of the Heishankou litharenites were more SiO-rich than those at *** at Heishankou are characterized by lower Ni-Co-Cr-V and slightly higher Th and La contents than those at *** indicates that the litharenites in the Liuyuan and Heishankou areas were derived from intermediatemafic and intermediate-felsic source rocks,*** setting discrimination plots suggest that the Liuyuan sandstones were deposited as detritus from an oceanic island arc,but the Heishankou sediments from an Andean continental *** petrological and geochemical data from these two types of Permian turbidites suggest that an arc-continent collision took place in the Early Permian,and this is consistent with the Permian termination of the southern Altaids.

关键词： Eeishan Mountains Permian turbidites Geochemistry Provenance Tectonic setting Southern Altaids

北山造山带花牛山岛弧东段钨矿床成矿时代和成矿动力学过程

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岩石学报 2015年第2期31卷 594-616页

作者：丁嘉鑫韩春明肖文交王忠梅杨晓梅中国科学院地质与地球物理研究所固体矿产资源研究室北京100029 中国科学院大学北京100029 中国科学院地质与地球物理研究所岩石圈演化国家重点实验室北京100029

北山造山带位于中亚造山带最南缘,为多期岛弧、蛇绿混杂岩拼贴而成的增生型造山带;晚古生代,北山造山带的构造活动引发强烈的花岗质岩浆活动,伴随有广泛的钨(钼)成矿作用;本文对北山南带花牛山岛弧三个典型含钨花岗岩体:盘陀山、鹰嘴红... 详细信息

北山造山带位于中亚造山带最南缘,为多期岛弧、蛇绿混杂岩拼贴而成的增生型造山带;晚古生代,北山造山带的构造活动引发强烈的花岗质岩浆活动,伴随有广泛的钨(钼)成矿作用;本文对北山南带花牛山岛弧三个典型含钨花岗岩体:盘陀山、鹰嘴红山及玉山岩体进行详细的锆石U-Pb年代学、全岩地球化学研究。SIMS锆石U-Pb定年结果表明该区成矿花岗岩分为两个侵入期次:(1)晚志留世月牙山-洗肠井蛇绿混杂岩南段出露花岗岩,其中,盘陀山二长花岗岩422.0±1.5Ma;盘陀山钾长花岗岩417.0±1.7Ma;鹰咀红山钾长花岗岩424.0±1.3Ma;(2)晚二叠世柳园蛇绿混杂带北侧玉山花岗岩体,定年结果为280.8±3.0Ma。岩石地球化学研究表明盘陀山-鹰嘴红山花岗岩带为过铝质S型花岗岩,玉山岩体为A型花岗岩。岩体稀土含量较高,具右倾型稀土配分模式,LREE分异强烈,HREE分异不明显,样品Eu亏损强烈。原始地幔标准化蛛网图中总体显示较为一致的分布模式,大离子亲石元素Ba、Sr呈现明显负异常,富集Th、U、Pb、Zr、Hf等元素而亏损高场强元素Ta、Nb、Ti、P。结合晚古生代北山构造演化过程,推断国庆-鹰嘴红山钨矿为公婆泉岛弧与花牛山岛弧碰撞阶段形成,而玉山钨矿床为晚华力西期弧后伸展构造背景的产物。

关键词：花牛山岛弧钨矿花岗岩时空背景北山造山带

Neoarchean Algoma-type banded iron formations from Eastern Hebei North China Craton: SHRIMP U-Pb age, origin and tectonic setting

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Neoarchean Algoma-type banded iron formations from Eastern H...

中国科学院地质与地球物理研究所2014年度（第14届）学术年会

作者： Chunming Han wenjiao xiao Benxun Su Zhengle Chen xiaohui Zhang Songjian Ao Jien Zhang Zhiyong Zhang Bo Wan Dongfang Song Zhongmei Wang Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences Department of Earth Sciences The University of Hong Kong Key Laboratory of Crustal Deformation and Processes Institute of GeomechanicsChinese Academy of Geological Sciences

Algoma-type BIF-hosted iron deposits occur in the Shirengou, Xingshan, Erma, Lingshan and Sijiaying areas of Eastern Hebei. The deposits are hosted in Archean rocks, and their formation was related to volcanic and sedimentary processes in small volcano-sedimentary basins. Supracrustal rocks of the Qianxi and Dantazi Groups were metamorphosed from granulite facies to amphibolites facies. Available data indicate that these BIF deposits mainly formed during Paleoarchean and Neoarchean times. The Paleoarchean BIF-hosted iron deposits are represented by the Xingshan deposit that yielded a SHRIMP U-Pb zircon age of 3389.5 ± 7.6 Ma. The other BIF-hosted iron deposits formed in the late Neoarchean, represented by the Shirengou, Shuichang, Lingshan, Erma and Sijiaying deposits that formed between 2605 Ma and 2503 Ma. The late Neoarchean BIF iron deposits are considered to have formed under a mantle plume environment. The Eu anomalies of the ore samples from Eastern Hebei show that the BIF ores formed in a hydrothermal related volcanic submarine environment, where submarine hydrothermal effluents associated with volcanic activities may have supplied both the iron and silica for the BIFs from Eastern Hebei.

关键词： SHRIMP zircon U-Pb Eu anomalies BIF Algoma-type Eastern Hebei