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国家自然科学基金(40372036)

作品数:12 被引量:386H指数:10
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12 条 记 录,以下是 1-10
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Single Zircon LA-ICP-MS U-Pb Dating of the Guandimiao and Wawutang Granitic Plutons in Hunan,South China and Its Petrogenetic Significance被引量:5
2007年
The Guandimao and Wawutang plutons are located at the center of Hunan, South China. The former is mainly composed of biotite monzonitic granites/granodiorites and two-mica monzonltic granites, but the latter only consists of biotite monzonitic granites. The zircon ages of 203.0±1.6 Ma (biotite monzonitic granites) and 208.0-23.2 Ma (two-mica monzonltic granites) for the Guandimao pluton and 204±3 Ma for the Wawutang pluton obtained with the LA-ICP-MS U-Pb dating indicate that they were formed during the late Indosinian. In consideration of other geochronological data from Indosinian rocks of South China and adjacent regions, it is inferred that the two plutons were derived from crustal materials by decompressional melting in a post-collisional tectonic setting during spontaneous thinning of the thickened curst. Moreover, the inherited zircon age of 1273±57 Ma from the Wawutang pluton indicates that the source of the two plutons is related to the early Proterozoic crustal basement.
CHEN WeifengCHEN PeirongZHOU XinminHUANG HongyeDING XingSUN Tao
关键词:GRANITE
U-Th-K放射成因热对花岗岩冷却-结晶过程影响的计算及地质意义被引量:21
2007年
花岗岩的放射性元素(U,Th,^40K)含量比玄武岩等基性.超基性岩高1-2数量级,其产生的放射成因热对花岗岩冷却-结晶时间有较大影响.推导出放射成因热使花岗岩熔体的冷却-结晶过程延长时间(认)的计算公式.采用该公式对湘南金鸡岭岩体二长花岗岩(U=5.31×10^-6,Th=23.1×10^-6,K2O=4.55%)进行的模拟计算得出,在二长花岗岩熔体冷却-结晶期间积累的放射成因热将使结晶过程延长的时间尺度(tA)大于二长花岗岩熔体从初始温度(Tm)冷却到结晶温度(瓦)所需时间尺度(tool)(tA=1.4tcol).这表明,花岗岩熔体中产生的放射成因热是影响其冷却-结晶过程的一个重要因素,也是造成中生代一新生代花岗岩基的结晶年龄与其侵位年龄不一致,产生较大的侵位-结晶时差的热动力学原因之一.
章邦桐吴俊奇凌洪飞陈培荣
南岭龙源坝复式岩体的地球化学特征研究被引量:25
2006年
龙源坝复式岩体是南岭花岗岩带的重要组成部分,曾被作为其东侧燕山期陂头岩体的组成部分。最新研究表明,岩体的主体形成于印支期,在时代和成因上明显不同于陂头岩体。该印支期花岗岩与燕山期花岗岩和燕山期正长岩在主要氧化物成分上存在显著差别,暗示它们可能不存在结晶分异的演化关系。在微量元素特征上,印支期花岗岩稀土元素总量较高,富集轻稀土元素;燕山期花岗岩的稀土元素含量低,亏损中稀土,Th/U、Nb/Ta和Zr/Hf比值小,分馏明显,暗示岩浆作用过程中流体作用比较强烈;燕山期正长岩以富集高场强元素和稀土元素为特征,类似于A型花岗岩。锶、钕同位素地球化学特征表明,龙源坝复式岩体属于壳源S型花岗岩,起源于早元古代壳-幔分异产生的地壳。
张敏陈培荣黄国龙凌洪飞
关键词:地球化学特征
南岭东段龙源坝复式岩体La-ICP-MS锆石U-Pb年龄及其地质意义被引量:67
2006年
龙源坝岩体是南岭花岗岩体群的一个重要组成部分,位于南岭东段,研究程度十分薄弱,至今未见可靠的同位素年龄报道。本文在运用阴极发光技术对岩体中的锆石进行细致的内部结构分析的基础上,利用La-ICP-MS锆石U-Pb原位定年方法进行了同位素年龄测定。结果表明,龙源坝岩体是一个印支期—燕山期多期次岩浆侵入形成的复式岩体,其中主体形成于印支期,尤其是印支早期。印支早期花岗岩的单颗粒锆石U-Pb年龄为241.0±5.9Ma和241.0±1.3Ma(两个样品),印支晚期花岗岩为210.9±3.8Ma,燕山期正长岩为149.4±1.2Ma。龙源坝岩体在时代和成因上不同于其东侧的陂头岩体,但相同于北侧的诸广山岩体有亲缘关系,因此在探讨该区的铀成矿前景时,应把诸广山与龙源坝两岩体整合起来考虑,并加强对龙源坝岩体的铀矿找矿工作。
张敏陈培荣黄国龙谭正中凌洪飞陈卫锋
关键词:印支期花岗岩南岭东段
Single zircon LA-ICPMS U-Pb dating of Weishan granite (Hunan, South China) and its petrogenetic significance被引量:31
2006年
A detailed microstructure analysis and LA-ICPMS U-Pb dating have been done for zir- cons of Weishan granite from Hunan Province, South China. The results indicate that the Weishan granite is a multistage batholith formed during the late Indosinian-early Yanshanian time. The intruded time of the late Indosinian granite is 211.0±1.6Ma and 215.7±1.9Ma (two samples), whereas that of the early Yanshanian granite is 187.4±3.5Ma and 184.5±5.1Ma (two samples). In combination with other geochronological data for Indosinian rocks of South China and the adjacent region, it is inferred that the late Indosinian granites of South China (especially Hunan Province) are probably formed under extension regime as a consequence of post-collision stress relaxation, which is a spontaneous response to intracontinental thickening attributed to the collision and extrusion of two Indosinian seams, namely Qinling-Dabie and Song Ma. Moreover, it is also deduced that the early Yanshanian granites of Hunan Province could not be directly related with the subduction of Paleo-Pacific plate towards Eurasian continent, and they are most likely derivation of the mid- or lower-crustal materials because of decompressional melting under the continuous extension setting.
DING Xing1, CHEN Peirong1, CHEN Weifeng1, HUANG Hongye2 & ZHOU Xinmin1 1. Department of Earth Science, Nanjing University, Nanjing 210093, China
关键词:LA-ICPMSU-PB
正、副角闪岩判别标志的新认识——赣中前寒武纪正、副角闪岩的矿物-岩石地球化学特征对比研究被引量:1
2005年
通过对赣中相山地区前寒武纪正、副角闪岩矿物学、岩石-地球化学特征系统对比研究,得出角闪岩成因判别标志的几点新认识:①提出了识别正、副角闪岩的角闪石矿物学标志;②阐明了区分正、副角闪岩的稀土元素地球化学特征;③对角闪岩微量元素地球化学特征提出采用模糊聚类分析与蛛网图相结合进行成因判别的有效方法;④提出综合应用15种元素对的比值(Ti/V,Ce/Yb,La/Yb,Th/Yb,La/Sm,La/Nb,Ce/Y,Rb/Sr,Nb/Y,Sm/Nd,Sr/Y,Sr/Ba,Zr/Y,Ti/Zr,Ti/Y)作为判别角闪岩成因的标志。
章邦桐凌洪飞陈培荣胡恭任姜耀辉于津海
关键词:前寒武纪赣中
华南东部中生代岩浆作用的动力学背景及其与铀成矿关系被引量:84
2004年
中国东南大陆在中生代岩浆作用十分强烈 ,形成了大批稀有和有色金属矿床。发生在早中生代 (T)的印支运动和晚中生代 (J K)的燕山运动是发动该区岩浆作用和成矿作用的动力条件。印支运动在区域挤压框架下导致华南大陆发生板内伸展作用 ,形成印支期花岗岩。燕山运动是相对于印支运动的后造山地质事件 ,以岩石圈发生强烈裂解为特征 ,诱发了大规模岩浆活动 ,并形成了丰富的矿产资源。受燕山期构造 岩浆热事件叠加的印支期花岗岩与铀成矿关系密切 ,可能是铀源体。因此 。
陈培荣
关键词:中生代岩浆作用地球动力学背景印支期花岗岩铀源
Chronological and geochemical studies of granite and enclave in Baimashan pluton, Hunan, South China被引量:34
2007年
Zircon LA-ICP-MS U-Pb dating reveals that the Baimashan Pluton is composed mainly of late Indosinian (204.5±2.8 Ma-209.2±3.8 Ma) biotite granodiorites/monzonitic granites (LIGs) and early Yanshanian (176.7±1.7 Ma) two-micas monzonitic granites (EYGs), and the coeval (203.2±4.5 Ma-205.1±3.9 Ma) mafic microgranular enclaves (MMEs) are generally found in the former. In addition, the ages of cores within zircons from LIGs and MMEs ranging from 221.4±4.0 Ma to 226.5±4.1Ma provide evidence of multistage magma intrusion during Indosinian in the study area. Measured 3010±20.6 Ma of inherited zircon age suggests that there may be recycling Archaean curstal material in existence in this area. LIGs and EYGs share some similar geochemical features: subalkaline and peraluminous granites, enrichment of Th, U, K, Ta, Zr, Hf and LREE but depletion of Ba, Nb, P, Ti and Eu, low εNd(t) values but high (87Sr/86Sr)i ratios, and old T2DM (ca. 1.9-2.0 Ga). The behaviors of incompatible elements and REE are mainly dominated by fractional crystallization of plagioclase, K-feldspar, ilmenite and apatite, but that of Sr isotope mainly controlled by EC-AFC. They are crust-sourced and derived from partial melting of paleo-Proterozoic metagreywackes and related to biotite dehydration melting. LIGs are formed in post-collisional tectonic setting as crustal local extension and thinning during late Indosinian. But EYGs may be evolved products of congeneric granitic magma with LIGs formed in late Indoinian, which were emplaced again when crust underwent extensive thinning and extension in post-orogenic tectonic setting during Yanshanian in SC after undergoing EC-AFC. MMEs should be cognate enclaves and derived from liquid immiscibility of host magma.
CHEN WeiFeng1, CHEN PeiRong1, HUANG HongYe2, DING Xing1,3 & SUN Tao1 1 State Key Laboratory of Mineral Deposit Research, Department of Earth Sciences, Nanjing University, Nanjing 210093, China
湖南阳明山岩体的La-ICP-MS锆石U-Pb定年及成因研究被引量:54
2006年
湖南阳明山岩体主要由二云母二长花岗岩和电气石白云母花岗岩构成,两类花岗岩的锆石La-ICP-MS定年结果分别为218.0±10.0Ma和218.9±3.4Ma,属印支晚期花岗岩。该岩体具有富SiO2(74.33%~76.03%)、Al2O3(13.34%~14.47%)和P2O5(0.21%~0.34%),高A/CNK(=1.15~1.32)的特征,为强过铝花岗岩。微量元素中富集Rb、Th、U、Pb、Ta、Ce、Sm、Y,明显亏损Ba、Sr、Nb、Ti、Eu,稀土总量低(ΣREE=17.49~90.43μg/g),轻稀土富集(LREE/HREE=6.43~15.64,LaN/YbN=5.26~10.94),中稀土轻度富集(GdN/YbN=1.76~2.26),具显著的负Eu异常(δEu=0.07~0.23)。岩体具高86Sr/87Sri(0.773980~0.742118)和低εNd(t)(-11.3^-12.1)的同位素特征,Nd模式年龄(1931~1992Ma)及残留锆石年龄(581~2492Ma),都指示阳明山花岗岩为典型的壳源型花岗岩,是在地壳伸展—减薄的构造背景下,古元古代变泥质岩减压熔融的产物。此外,获得多组继承/捕虏锆石年龄值(581~2492Ma),为本区存在早前寒武纪变质结晶基底及华南陆壳具多阶段生长演化特征提供了佐证。
陈卫锋陈培荣周新民黄宏业丁兴孙涛
关键词:过铝质花岗岩印支运动
桂东北豆乍山花岗岩年代学与地球化学特征被引量:71
2008年
豆乍山花岗岩主要由中细粒二云母二长花岗岩构成,是桂东北苗儿山复式花岗岩体中段的一个重要产铀的岩体。单颗粒锆石 SHRIMP U-Pb 年龄为228±11Ma,属于印支期岩浆活动产物。地球化学特征显示该花岗岩以过铝、富硅、富碱和低 CaO/Na_2O 比值为特征,微量元素主要富集 Rb、Th、U 和 Ta,亏损 Sr、Ba 和 Ti。稀土总量30.24×10^(-6)~139.18×10^(-6),轻稀土轻微富集(LREE/HREE=4.00~6.35,(La/Yb)_N=3.24~6.74),Eu 亏损明显(δEu=0.14~0.19)。结合其它相关地质资料,表明豆乍山花岗岩是壳源型花岗岩,是在印支运动晚期地壳伸展—减薄的构造背景下,成分为泥质的变质岩通过低程度部分熔融方式而形成。
谢晓华陈卫锋赵葵东孙涛陈培荣蒋少涌朱康任李妩巍
关键词:锆石SHRIMPU-PB定年印支期元素地球化学桂东北
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