A Comparison of Nd Isotopes of Granitoids from the Central Asian Orogenic Belt and Qinling-Dabie Orogen,and Implications for Understanding of Crustal Growth from Accretion to Collision     

WANG Tao  WANG Xiaoxi  TONG Ying  HUANG He  LI Shan  ZHANG Jianjun  GUO Lei  ZHANG Lei  SONG Peng  QIN Qie 《《地质学报》英文版》2019,93(Z1):150-151

正Orogens can generally be divided into two types:accretionary and collisional.The fundamental differences in deep-crustal compositions and architecture from accretion to collision and how to identify them is not well understood.This is one of the major aims of the IGCP 662 project (www.igcp662.org.cn).The Central Asian Orogenic Belt (CAOB) is a typical and the world's largest Phanerozoic accretionary orogenic belt and the  相似文献   

Geological and Fluid Inclusion Constraints on Gold Deposition Processes of the Dayingezhuang Gold Deposit,Jiaodong Peninsula,China   总被引：1，自引：0，他引：1  

CHAI Peng  ZHANG Zhiyu  HOU Zengqian 《《地质学报》英文版》2019,93(4):955-971

The Dayingezhuang gold deposit, hosted mainly by Late Jurassic granitoids on Jiaodong Peninsula in eastern China, contains an estimated 170 t of gold and is one of the largest deposits within the Zhaoping fracture zone. The orebodies consist of auriferous altered pyrite–sericite–quartz granites that show Jiaojia-type (i.e., disseminated and veinlet) mineralization. Mineralization and alteration are structurally controlled by the NE- to NNE-striking Linglong detachment fault. The mineralization can be divided into four stages: (K-feldspar)–pyrite–sericite–quartz, quartz–gold–pyrite, quartz–gold–polymetallic sulfide, and quartz–carbonate, with the majority of the gold being produced in the second and third stages. Based on a combination of petrography, microthermometry, and laser Raman spectroscopy, three types of fluid inclusion were identified in the vein minerals: NaCl–H2O (A-type), CO2–H2O–NaCl (AC-type), and pure CO2 (PC-type). Quartz crystals in veinlets that formed during the first stage contain mainly AC-type fluid inclusions, with rare PC-type inclusions. These fluid inclusions homogenize at temperatures of 251°C–403°C and have low salinities of 2.2–9.4 wt% NaCl equivalent. Quartz crystals that formed in the second and third stages contain all three types of fluid inclusions, with total homogenization temperatures of 216°C–339°C and salinities of 1.8–13.8 wt% NaCl equivalent for the second stage and homogenization temperatures of 195°C–321°C and salinities of 1.4–13.3 wt% NaCl equivalent for the third stage. In contrast, quartz crystals that formed in the fourth stage contains mainly A-type fluid inclusions, with minor occurrences of AC-type inclusions; these inclusions have homogenization temperatures of 106°C–287°C and salinities of 0.5–7.7 wt% NaCl equivalent. Gold in the ore-forming fluids may have changed from Au(HS)0 as the dominant species under acidic conditions and at relatively high temperatures and fO2 in the early stages, to Au(HS)2– under neutral-pH conditions at lower temperatures and fO2 in the later stages. The precipitation of gold and other metals is inferred to be caused by a combination of fluid immiscibility and water–rock interaction.  相似文献   

Polarization Anomaly Characteristics and Prospecting in Ag-Pb-Zn Polymetallic Ore Deposit in Changtuxili Area of Inner Mongolia     

MA Yixing  HE Peng  LIU Zhujian 《《地质学报》英文版》2019,93(Z2):442-443

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滇西北衙铁金多金属矿床成矿地质特征及其两阶段成矿过程研究——以万硐山矿段为例          下载免费PDF全文

牛浩斌  丁俊  李俊  宁括步  王鹏  任飞 《地质找矿论丛》2019,34(1):1-9

滇西北衙铁金多金属矿床为西南三江富碱斑岩-多金属成矿带中南段典型矿床之一,成矿严格受富碱斑岩及其相关的深大断裂控制,伴随多期富碱斑岩脉体侵入、热液交代与围岩蚀变、矿物质富集及次生富集过程,构成了复杂的斑岩-矽卡岩成矿系统和地表次生成矿系统。文章以万硐山露天采场区大比例尺地质填图为基础,重新厘定和梳理各地质体及其间相互关系,取得了万硐山矿段详细的成矿地质特征及原生矿化的两阶段成矿新认识。  相似文献   

Analyses of the Compositional Characteristics and Sources of the Organochlorine Pesticides in the Surface Sediments of Guanghai Bay,Taishan City,Guangdong Province     

FAN Xiaoping  HE Yicheng  ZHANG Peng  Huo Zhuqing  ZHEN Leiming 《《地质学报》英文版》2019,93(Z2):65-66

Organochlorine pesticides (OCPs) are a class of toxic and harmful persistent organic pollutants widely found in environment. Hexachlorocyclohexane (HCHs) and DDTs are two of the most widely used OCPs (Qiu et al., 2004), so it is important to find out their compositional characteristics and sources in surface sediments. Guanghai Bay is located in the south of Guanghai Bay Industrial Park in Taishan City, Guangdong Province. It borders Huangmaohai to the east and Zhenhai Bay to the west, covering an area of about 236 square kilometers. In this study, surface sediments were collected at 16 sites in Guanghai Bay (Fig. 1). After the surface sediments were pretreated, GC‐MS was used to analyze OCPs. A total of 14 OCPs were detected and their content was shown in Table 1. The concentration of ΣOCPs ranged between 0.507～0.860ng·g‐1, with an average of 0.680 ng?g‐1. In general, the content of ΣOCPs was the highest at No. A12 site. The concentrations of these 14 detected OCPs ordered as dieldrin > epoxy heptachlor > P, P'‐DDD > γ‐HCH >endrin >aldrin > P, P'‐DDE >mirex >hexachlorobenzene >P, P'‐DDT > α‐HCH > δ‐HCH >β‐HCH > heptachlor.  相似文献   

湖南仁里稀有金属矿田地质特征、成矿时代 及其找矿意义   总被引：4，自引：3，他引：1  

刘翔  周芳春  李鹏  李建康  黄志飚  石威科  黄小强  张立平  苏俊男 《矿床地质》2019,38(4):771-791

仁里稀有金属矿田位于幕阜山岩体西南缘,是华南地区重要的稀有金属矿产地之一。文章旨在通过对区域成矿条件、矿田地质特征、地球化学特征、成岩成矿时代与稀有金属成矿作用的综合分析,为矿田勘查设计乃至华南地区稀有金属找矿与研究提供理论依据。在矿田范围内对燕山期、武陵期花岗岩及每个矿区代表性伟晶岩进行了系统采样,开展了岩石化学成分分析,同时对矿田内二云母二长花岗岩及锂辉石伟晶岩分别进行了锆石U-Pb、白云母Ar-Ar同位素定年。研究表明:①多期造山与燕山期陆内活化是成矿的有利地质背景,多阶段伸展作用导致幕阜山地区多期大规模的多金属成矿作用发生;②矿田构造主要以NE(或NNE)向构造为主,复合改造NW向及近EW向构造,NE(或NNE)向和NW(或近EW)向构造呈现立交桥式的构造格局,控制了花岗岩和伟晶岩分布;③矿田内伟晶岩属极高分异、富硅、过铝质花岗质岩石,燕山期花岗岩属陆壳改造"S型"花岗岩;④幕阜山岩体由岩体内接触带往岩体外接触带(10 km),由黑云母伟晶岩→二云母伟晶岩→白云母伟晶岩→锂云母伟晶岩→锂辉石白云母伟晶岩过渡,形成了较完整的稀有金属演化序列:无矿化→Be→Be+Nb+Ta→Be+Nb+Ta+Li→Be+Nb+Ta+Li+Cs;⑤稀有金属成矿与构造岩浆时空演化、构造组合、特别是岩浆的分异程度密切相关,矿田内燕山期花岗岩年龄139.3～146.2 Ma,稀有金属成矿年龄为130.5～130.8 Ma。  相似文献   

Late Quaternary glaciations in the Cogarbu valley,Bhutanese Himalaya   总被引：1，自引：0，他引：1  

Xu Peng  Yixin Chen  Gengnian Liu  Beibei Liu  Yingkui Li  Qing Liu  Yesong Han  Weilin Yang  Zhijiu Cui 《第四纪科学杂志》2019,34(1):40-50

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吉林省红旗岭矿区7号岩体群地质特征及对地质找矿的指导意义     

尹贵志  吕成对  翟国红  毕鹏  贾万金  崔军 《吉林地质》2019,38(2):9-15

红旗岭矿区的南东部存在7、32、33号三个岩体,一般统称为7号岩体群。7号岩体是矿区发现含铜、镍矿最大的岩体,32与33号岩体分布在7号岩体的北西部。通过对这三个岩体的地质特征进行分析,利用3Dmine软件建模技术,对三个岩体、岩相、矿体建立三维模型。对模型进行观察、分析,结合成岩成矿地质理论,发现三个岩体是由来自7号岩体的南东部深部岩浆源生成的,岩浆由7号岩体的南东部深部向北西方向侵入,地质历史上三个岩体是一个大岩体,只是经过长期的风化剥蚀和地质构造改造形成目前的3个岩体,显示7号岩体的南东部深部具有找矿潜力。  相似文献   

土地利用对溶丘洼地土壤容重、水分和有机质空间异质性的影响——以南洞流域驻马哨洼地为例   总被引：1，自引：1，他引：0  

刘鹏  蒋忠诚  蓝芙宁  李衍青  于洋 《中国岩溶》2019,38(1):100-108

为了探究溶丘洼地土壤空间异质性及其影响因素,本文以驻马哨溶丘洼地为研究对象,利用经典统计学和地统计学的方法,从不同土地利用、坡度、坡向、土壤深度分析土壤容重、水分及有机质的空间异质性。结果表明:（1）土壤有机质为强变异,变异系数为0.71,容重和水分变异系数分别为0.15、0.11,属中等变异,土壤容重和水分呈极显著负相关,和有机质呈显著负相关,相关系数分别为-0.609、-0.581;（2）块基比介于0.78~0.97,随机部分引起的空间变异程度较大,空间自相关较小,且模型拟合较好。（3）耕地土壤有机质、水分含量最低,容重最大,而灌木土壤反之;（4）北坡土壤容重高于南坡,变异系数小于南坡;而土壤水分、有机质低于南坡,变异系数高于南坡。从不同坡位、坡向的比较中,皆体现了土地利用对土壤空间异质性的影响。在土地利用作为主要因素的影响下,驻马哨洼地土壤水分、容重、有机质由随机部分引起的空间变异增加,空间自相关减小。   相似文献   

吉林省柳河县半截沟铁矿床地质特征及找矿标志     

张天瑞  于美娇  曾年发  张鹏  潘月贺  梁扬名  黄一格 《吉林地质》2019,38(3):42-45

吉林省柳河县半截沟铁矿床赋存于中太古界斜长角闪片麻岩、黑云斜长片麻岩中。矿体形态简单,呈似层状、扁豆状分布。该文总结了矿床地质特征,确定了该区铁矿床的找矿标志。  相似文献