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Geochemistry and Geochronology of the Cenozoic Zhalaga Granitoids of the Yulong Alkali-rich Porphyry Belt in Eastern Tibet(Xizang), SW China: Petrogenesis and Tectonic Implications

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Acta Geologica Sinica(English Edition) 2020年第6期94卷 2077-2090页

作者： XU Chi yuan yajuan XIAO Yang GUO Feng XIA Bin LU Ye School of Marine Sciences Sun Yat-sen UniversityGuangzhou 510006China Key Laboratory of Offshore Oil Exploration and Development of Guangdong Higher Education Institutes Guangzhou 51006China Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering Guangzhou 510006China School of Geography South China Normal UniversityGuangzhou 510631China Guangdong Marine Geological Survey Institute Guangzhou 510075China

Large-scale Cenozoic magmatic rocks from the interplay between the Indian and Eurasian plate are exposed in the Yulong porphyry copper belt in the northern Jinshajiang-Ailaoshan domain.Alkali-rich magmas along the Yulong porphyry copper belt can reveal the tectono-magmatic processes in the Sanjiang region.In this study,we present new zircon U-Pb-Hf isotopes and whole rock geochemistry of Cenozoic granitoids from the Zhalaga area in the northern Yulong porphyry copper belt.The Zircon U-Pb dating results show that the Zhalaga granitic porphyry crystallized at ca.42-38 Ma.These porphyry deposits are depleted in Nb,Ta,Sr,and Ti enriched in alkaline and rare earth elements(REEs),and exhibit high zircon saturation temperatures,that strongly indicate A-type affinity.These data and the generally positiveεHf(t)values(2.0-4.5)suggest the magmas originated from a hybrid of partial melting of subduction-modified lithospheric mantle,possibly triggered by upwelling of the asthenospheric mantle.Geochronological and geochemical data of the current and previous studies distinguish three magmatic phases during the Cenozoic in the Jinshajiang-Ailaoshan region:(1)ca.62-48 Ma;(2)ca.44-30 Ma;and(3)ca.28-16 Ma.The strong collision between the Indian and Eurasian plates produced relatively fast convergence rates during the first episode(ca.62-48 Ma),whereas the subsequent right-lateral strike-slip faulting in the Jinshajiang fault zone initiated at ca.43 Ma is associated with the relatively low India-Eurasia convergence rates during ca.44-30 Ma.These significantly impacted the nature and spatial distribution of the magmatism and the large-scale metallogeny during the Cenozoic in the Sanjiang region.We suggest that the Zhalaga alkali-rich magmas occurred in a transition period from involving soft to hard collisional settings.This remarkable example demonstrates that alkali-rich magmas with A-type affinity are also generated in an orogenic tectonic setting.

关键词： alkali-rich magmas A-type granite Jinshajiang-Ailoashan domain

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Geochemistry,Geochronology,Sr-Nd Isotopic Compositions of Jiang Tso Ophiolite in the Middle Segment of the Bangong- Nujiang Suture Zone and Their Geological Significance

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Acta Geologica Sinica(English Edition) 2015年第2期89卷 389-401页

作者： HUANG Qiangtai LI Jianfeng CAI Zhourong XIA Lianze yuan yajuan LIU Huichuan XIA Bin School of Marine sciences Sun Yat-Sen University Key Laboratory of Offshore Oil Exploration and Development Guangdong University Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering Guangzhou Institute of Geochemistry Chinese Academy of Sciences School of Earth Science and Geological Engineering Sun Yat-sen University

The Jiang Tso ophiolite, situated in the middle segment of the Bangong- Nujiang Suture Zone, is a part of the easternmost Qieli Lake ophiolite subzone and is close to the south of Pung Lake ophiolite. The rock association of Jiang Tso ophiolite is relatively complete and is mainly composed of metamorphic peridotite, gabbro and diabase. Comparing with N-MORB, the ophiolite is high in Mg and low in Ti, K, Na, P, and is depleted in Nb, Ta, Hf, Th and enriched in Rb, Sr and Ba. Geochemical characteristics of the Jiang Tso ophiolite indicate it is of a supra-subduction zone type formed in the spreading ridge of back arc basin. The SHRIMP U-Pb dating of zircons from the gabbro yielded a weighted average age of 188.1±4.1 Ma （MSWD=1.4）, indicating the Jiang Tso ophiolite was formed in the late stage of early Jurassic. The Sr, Nd isotopic compositions show that the Tethyan mantle domain is the depleted mantle （DM）, with enriched mantle domain II （EMII）. They have the same Sr, Nd isotopic composition with the India Ocean MORB type.

关键词： geochemistry SHRIMP U-Pb dating Sr-Nd isotopes tectonic environment Tibet

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The Dihedral Angle and Intersection Processes of a Conjugate Strike-Slip Fault System in the Tarim Basin, NW China

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Acta Geologica Sinica(English Edition) 2018年第1期92卷 74-88页

作者： WU Guanghui yuan yajuan HUANG Shaoying Thomas Matthew Vandyk XIAO Yang CAI Quan LUO Bingxu Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering School of Marine Sciences Sun Yat-sen University Guangzhou 510006 China PetroChina Tarim Oilfield Company Korla 841000 China Department of Earth Sciences Royal Holloway and Bedford New College University of London Egham Surrey TW20 OEX UK

Recent studies, focused on dihedral angles and intersection processes, have increased understandings of conjugate fault mechanisms. We present new 3-D seismic data and microstructural core analysis in a case study of a large conjugate strike-slip fault system from the intracratonic Tarim Basin, NW China. Within our study area, ＂X＂ type NE and NW trending faults occur within Cambrian- Ordovician carbonates. The dihedral angles of these conjugate faults have narrow ranges, 19~ to 62~ in the Cambrian and 26~ to 51~ in the Ordovician, and their modes are 42~ and 44~ respectively. These data are significantly different from the ~60~ predicted by the Coulomb fracture criterion. It is concluded that：（1） The dihedral angles of the conjugate faults were not controlled by confining pressure, which was low and associated with shallow burial; （2） As dihedral angles were not controlled by pressure they can be used to determine the shortening direction during faulting; （3） Sequential slip may have played an important role in forming conjugate fault intersections; （4） The conjugate fault system of the Tarim basin initiated as rhombic joints; these subsequently developed into sequentially active ＂X＂ type conjugate faults; followed by preferential development of the NW-trending faults; then reactivation of the NE trending faults. This intact rhombic conjugate fault system presents new insights into mechanisms of dihedral angle development, with particular relevance to intracratonic basins.

关键词： Conjugate fault strike-slip dihedral angle fault intersection faulting process Carbonate

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Tectonic Evolution of the Meso-Tethys in the Western Segment of Bangonghu-Nujiang Suture Zone: Insights from Geochemistry and Geochronology of the Lagkor Tso Ophiolite

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Acta Geologica Sinica(English Edition) 2015年第2期89卷 369-388页

作者： yuan yajuan YIN Zhengxin LIU Weiliang HUANG Qiangtai LI Jianfeng LIU Hongfei WAN Zhifeng CAI Zhourong XIA Bin School of Marine Sciences Sun Yat-sen University Key Laboratory of Offshore Oil Exploration and Development of Guangdong Higher Education Institutes Guangzhou Institute of Geochemistry Chinese Academy of Sciences Xizang Geological Survey

The subduction of the Bangonghu-Nujiang Meso-Tethys and the collision between the Lhasa and Qiangtang blocks were important events in the growth of the Tibetan crust. However, the timing of collision initiation and closure timing, as well as nature and structure of the Bangonghu ocean basin, are still poorly constrained. The Lagkor Tso ophiolite, located in the south of Gerze County, Tibet, is one of the most completed ophiolites preserved in the southern side of the Bangonghu- Nujiang suture zone. This study discussed the tectonic evolution of the Bangonghu-Nujiang suture zone as revealed by the Lagkor Tso ophiolite investigated by field investigations, petrology, geochemistry, geochronology and tectonic analysis methods. We present new LA-ICP-MS zircon U-Pb and 39Ar/4~Ar ages for the Lagkor Tso ophiolite, in addition to geochemical and platinum-group element （PGE） data presented for the Lagkor Tso ophiolite in Tibet. It is suggested that the ancient Lagkor Tso oceanic basin split in Middle Jurassic （161.2 ± 2.7 Ma - 165.4 ± 3.5 Ma）, and experienced a second tectonic emplacement during the Early Cretaceous （137.90 ± 6.39 Ma）. The Lagkor Tso ophiolite likely developed in an independent suture zone. The Bangonghu-Nujiang ocean subducted southwards, and the dehydration of the subducting oceanic crust materials caused partial melting of the continental mantle wedge, which formed the second-order expanding center of the obduction dish. This led to inter-arc expansion, followed by the formation of inter-arc and back-arc basins with island arc features, which are represented by ophiolites around the Shiquanhe-Lagkor Tso -Yongzhu region. The tectonic environment presently can be considered to be similar to that of the current Western Pacific, in which a large number of island arc-ocean basin systems are developed.

关键词： ophiolite geochemistry geochronology inter-arc basin Lagkor Tso Bangonghu-Nujiangsuture zone

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Mixing of Enriched Lithospheric Mantle-Derived and Crustal Magmas： Evidence from the Habo Cenozoic Porphyry in Western Yunnan

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Acta Geologica Sinica(English Edition) 2018年第5期92卷 1753-1768页

作者： XIA Bin LU Ye yuan yajuan CHEN Weiyan ZHANG Xiao XU Chi YU Shengrui WAN Zhifeng School of Marine Sciences Sun Yat-sen University Guangzhou 510006 China Key Laboratory of Offshore Oil Exploration and Development of Guangdong Higher Education Institutes Guangzhou 51006 China Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering Guangzhou 510006China

New zircon U–Pb ages, whole-rock geochemistry and zircon Hf isotopes from the Habo porphyry Western Yunnan, China, were determined to provide constraints on the timing of uplift of the Eastern Tibetan Plateau. The intrusive rocks consist of shoshonitic porphyry（syenite porphyry and monzonite porphyry）. Zircon laser ablation inductively coupled plasma mass spectrometry（LA-ICPMS） U–Pb dating indicates coeval emplacement ages of ～35 Ma. The porphyries have alkaline affinities, enrichment in large ion lithophile elements（LILEs） and light rare earth elements（LREEs）（e.g., Rb, Th, U, Pb）, with depletion of high field strength elements（HFSEs）（e.g., Nb, Ti, Ta） and weak Eu anomalies. They display uniform Lu–Hf isotopic compositions with negative zircon εHf（t） values ranging from-3.9 to-0.6. The chemical characteristics of the syenite porphyries indicated that they most likely originated from the lower crust, with mantle-derived material involved in their generation. Geochemically, the monzonite porphyries are similar to the syenite porphyries; however, the lower MgO contents suggest that they were produced by different degrees of partial melting of the same lower crust source. Combined with the geochemical and isotopic data in this paper, imply that the alkali-rich porphyries of the Habo polymetallic deposit were derived from the partial melting of lower crust, enriched by mantle magma, formed in a conversion stage from stress extrusion（a strike-slip shear process） to local stress relaxation（a strike-slip pull-apart process） at the Ailaoshao tectonic zone.

关键词： geochronology geochemistry Lu–Hf isotopes Habo porphyry western Yunnan

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Zircon U-Pb Geochronology and Hf Isotopic Constraints on Petrogenesis of Plagiogranite from the Cuomuqu Ophiolite,Bangong Lake Area,North Tibet

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Acta Geologica Sinica(English Edition) 2015年第2期89卷 418-440页

作者： YIN Zhengxin yuan yajuan Lü Baofeng CAI Zhourong ZHENG Hao HUANG Qiangtai XIA Bin ZHONG Yun XIA Zhongyu SHI Xiaolong GUAN Yao School of Marine Sciences Sun Yat-sen University Key Laboratory of Offshore Oil Exploration and Development of Guangdong Higher Education Institutes Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering

Field observation, geochemical signatures and zircon Hf isotope data indicate that Cuomuqu ophiolite in the Bangonghu area was formed in a back-arc basin （BAB） above a supra- subduction zone （SSZ）. Zircon U-Pb dating of the diabase from the Cuomuqu massif yielded an age of 164.3±1.9 Ma, thus indicating that the ophiolite complex was formed in the Middle Jurassic during back-arc extension of the mature Bangonghu-Nujiang Ocean. The zircon εHf（t） and TDMC values of the plagiogranite are similar to the εHf（t） and TDM of the diabase, respectively. The mode of occurrence of plagiogranites and their bulk-rock and Hf isotope characteristics indicate that they were derived from the mantle, associated with the surrounding gabbro and diabase, and were formed by partial melting of altered and hydrated mafic rocks under shear conditions during lateral drifting of the oceanic crust. The zircon U-Pb age of the plagiogranite is 156.4±1.4 Ma, and it is 7.9 Ma younger than the hosting diabase. In this study, zircon chronological and Hf isotopic data were tentatively analyzed to determine the genesis of plagiogranites in the Cuomuqu ophiolite complex.

关键词： Bangonghu-Nujiang suture zone ophiolite plagiogranite zircon U-Pb dating zircon Hf isotope tectonic setting

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玉龙铜(钼)矿带多霞松多岩体成因:锆石U-Pb年代学和岩石地球化学约束

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地质科学 2024年第1期59卷 103-119页

作者：袁亚娟欧诗敏吴楷杨骆小康柯依晴肖敬国张玉泉夏斌华南师范大学地理科学学院广州510631 中国科学院广州地球化学研究所广州510640 中山大学海洋学院广东珠海519082

玉龙铜(钼)矿带的成因机制和动力学背景一直存在争议。本文选择目前研究程度较低的多霞松多岩体,对该岩体含矿斑岩开展岩相学、年代学、岩石地球化学及锆石Hf同位素分析。研究表明,多霞松多岩体主要由二长花岗斑岩和碱长花岗斑岩组成,其... 详细信息

玉龙铜(钼)矿带的成因机制和动力学背景一直存在争议。本文选择目前研究程度较低的多霞松多岩体,对该岩体含矿斑岩开展岩相学、年代学、岩石地球化学及锆石Hf同位素分析。研究表明,多霞松多岩体主要由二长花岗斑岩和碱长花岗斑岩组成,其中,二长花岗斑岩的主要造岩矿物为钾长石、斜长石和石英,碱长花岗斑岩的主要造岩矿物为钾长石和石英。两种岩石属于高钾钙碱性—钾玄质侵入岩,具有富碱高钾的特征;亏损Nb、Ti等高场强元素,富集Rb、Th、U等大离子亲石元素和Pb;稀土元素含量较高(ΣREE=145.04×10^(-6)~290.91×10^(-6)),富集轻稀土(LREE/HREE=6~37)。铕表现为从二长花岗斑岩的弱负异常(Eu/Eu^(*)=0.66~0.84)到碱长花岗斑岩的中等负异常(Eu/Eu^(*)=0.35~0.39)。锆石U-Pb定年显示,二长花岗斑岩的成岩年龄为38.3±0.6 Ma,碱长花岗斑岩的成岩年龄为37.8±1.0 Ma,两者形成时代基本一致,均属于喜马拉雅期,表明在多霞松多地区始新世存在一期重要的岩浆热液Cu-Mo成矿事件。多霞松多含矿斑岩的锆石ε_(Hf)(t)范围在+1.3~+2.6之间。结合元素和同位素地球化学特征,指示多霞松多含矿斑岩可能来源于亏损地幔分异的新生玄武质下地壳,受控于印度板块与欧亚板块碰撞诱发的金沙江走滑断裂系统。

关键词：地球化学锆石U-Pb年龄锆石Hf同位素富碱斑岩多霞松多

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三阴性乳腺癌患者CD117、DOG1表达水平与临床病理特征及预后的相关性

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协和医学杂志 2024年第3期15卷 616-623页

作者：王雅娟王媛任新瑜北京市隆福医院病理科北京100010 中国医学科学院北京协和医院病理科北京100730

目的探究CD117、DOG1表达水平与三阴性乳腺癌(triple-negative breast cancer, TNBC)患者临床病理特征及预后的相关性。方法回顾性纳入2000—2011年北京协和医院的TNBC患者。取其肿瘤组织芯片,采用免疫组化法检测肿瘤细胞中CD117、DOG... 详细信息

目的探究CD117、DOG1表达水平与三阴性乳腺癌(triple-negative breast cancer, TNBC)患者临床病理特征及预后的相关性。方法回顾性纳入2000—2011年北京协和医院的TNBC患者。取其肿瘤组织芯片,采用免疫组化法检测肿瘤细胞中CD117、DOG1表达情况,分析二者与患者年龄、肿瘤直径、美国癌症联合委员会(American Joint Committee on Cancer, AJCC)分期、组织学分级、P53、Ki-67增殖指数等临床病理特征的关系,及其对患者生存期的影响。结果共入选符合纳入与排除标准的TNBC患者185例,其中CD117阳性24例(12.97%),DOG1阳性22例(11.89%),二者共表达率为1.62%。相较于肿瘤细胞CD117阴性患者,CD117阳性患者中高Ki-67增殖指数(87.50%比67.70%,P=0.048)、基底样TNBC(95.83%比74.53%,P=0.020)、P53弥漫强阳(33.33%比13.66%,P=0.032)的比例均更高。相较于DOG1阴性患者,DOG1阳性患者中肿瘤直径≤2 cm(22.73%比45.40%,P=0.026)、基底样TNBC(54.55%比80.37%,P=0.015)的比例均更低。中位随访时间71个月(范围:2~170个月),失访4例(2.16%),复发或远处转移66例(35.68%),死亡34例(18.38%)。生存分析显示,AJCC分期(HR=7.624,95%CI:2.187~26.576,P=0.001)及CD117阳性伴P53弥漫强阳(HR=3.942,95%CI:1.366~11.379,P=0.011)与TNBC患者总生存期呈负相关。结论 CD117阳性、DOG1阴性与基底样TNBC具有一定相关性,且CD117阳性伴P53弥漫强阳者总生存期更短,死亡风险增高。

关键词：三阴性乳腺癌 CD117 DOG1 预后

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南海北部深水盆地沉积-构造的差异性及其油气意义

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大地构造与成矿学 2008年第4期32卷 441-447页

作者：吕宝凤袁亚娟中国科学院广州地球化学研究所中国科学院边缘海地质重点实验室广东广州510640

南海北部深水区自西向东依次分布着琼东南盆地、珠江口盆地、台西南盆地等新生代被动陆缘盆地,这些盆地经历了大致相当的从裂陷到坳陷的构造演化史,但在张裂活动过程中存在着明显的沉积-构造的差异性。构造沉降特征分析显示:在同一构造... 详细信息

南海北部深水区自西向东依次分布着琼东南盆地、珠江口盆地、台西南盆地等新生代被动陆缘盆地,这些盆地经历了大致相当的从裂陷到坳陷的构造演化史,但在张裂活动过程中存在着明显的沉积-构造的差异性。构造沉降特征分析显示:在同一构造带上自西向东有盆地主要构造沉降发生的时段逐步变晚的趋势;在不同构造带上自北向南有盆地主要构造沉降发生的时段逐步变晚的趋势。这种沉积-构造的差异性对烃源岩的发育类型、分布及生储盖组合等方面有明显的控制作用,表现为:裂谷期构造沉降幅度大的盆地,陆相烃源岩发育,以陆生陆储陆盖型成藏组合为主;裂后期构造沉降幅度大的盆地,海相烃源岩发育规模较大,海生海储海盖型成藏组合及混生海储海盖型生储盖组合所占分量逐渐增多。推测渐新统湖相-湖沼相及海陆过渡相源岩和中新统海相烃源岩应是南海北部深水区油气的主要来源,陆生海储海盖型、海生海储海盖型及混生海储海盖型生储盖组合应是深水区基本生储盖组合类型。

关键词：南海北部深水盆地沉积-构造差异生储盖组合

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羊奶粉生产环节阪崎肠杆菌分离鉴定及其毒力基因和药敏检测

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中国食品学报 2015年第5期15卷 175-181页

作者：王倩宁葛武鹏袁亚娟杨静王欢马园西北农林科技大学食品科学与工程学院陕西杨凌712100 陕西省咸阳市产品质量监督检验所陕西咸阳712000 陕西杨凌质量技术检测检验所陕西杨凌712100

目的:分析羊奶粉生产环节阪崎肠杆菌的污染状况,分离株毒力基因携带情况以及耐药性。方法:采自某羊奶粉加工厂空气过滤车间、液态奶车间、流化床车间、喷雾干燥车间和包装车间的生产样品及环境样品共180份,按国标GB4789.40-2010和PCR方... 详细信息

目的:分析羊奶粉生产环节阪崎肠杆菌的污染状况,分离株毒力基因携带情况以及耐药性。方法:采自某羊奶粉加工厂空气过滤车间、液态奶车间、流化床车间、喷雾干燥车间和包装车间的生产样品及环境样品共180份,按国标GB4789.40-2010和PCR方法进行阪崎肠杆菌的分离鉴定;采用PCR方法检测cpa、hly、sip和omp X毒力基因;采用琼脂稀释法测定药敏性。结果:27个采样点中有14个阪崎肠杆菌阳性点,检出率为51.9%;180份样品中有29份检出阪崎肠杆菌,污染率为16.1%;阳性样品主要为粉状和棉签涂抹样品,污染率分别为23.5%和16.9%。毒力基因检出率为100%,毒力基因类型有cpa-omp X和cpa-hly-omp X,检出率分别为79.3%,20.7%。29株菌对利福平、甲氧苄啶/磺胺甲恶唑、头孢西丁钠、阿莫西林、阿莫西林/克拉维酸的耐药率依次为100%,75.9%,6.9%,3.4%和3.4%;对其它11种抗生素均敏感,多重耐药率为6.9%。结论:羊奶粉加工厂存在阪崎肠杆菌的污染。空气流动、粉尘污染、操作人员交叉污染及生产设备清洗消毒不彻底可能是加工过程中该菌的污染途径。分离株毒力基因携带率较高,对大多数供试抗生素敏感,出现多重耐药现象。

关键词：阪崎肠杆菌羊奶粉加工厂污染途径毒力基因药敏性

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