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国家自然科学基金(40133020)

作品数:44 被引量:1,335H指数:18
相关作者:许文良高山王清海王冬艳柳小明更多>>
相关机构:吉林大学西北大学中国地质大学更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划国家教育部博士点基金更多>>
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中国东部岩石圈减薄研究中的几个问题
中国东部岩石圈减薄是近10年来国内外研究的热门课题,但关于岩石圈减薄的具体时间、机制及其构造控制因素,多有争论。根据目前的研究资料,文中对上述问题进行了全面的讨论。初步认为该岩石圈减薄发生在晚中生代,且在120~130 ...
吴福元葛文春孙德有郭春丽
关键词:岩石圈减薄中生代
Contrast in Fluid M etallogeny between the Tianmashan Au-S Deposit and the Datuanshan Cu Deposit in Tongling,Anhui Province被引量:2
2003年
A comprehensive contrast of ore-forming geological background and ore-forming fluid features, especially fluid ore-forming processes, has been performed between the Tianmashan and the Datuanshan ore deposits in Tongling, Anhui Province. The major reasons for the formation of the stratabound skarn Au-S ore deposit in Tianmashan and the stratabound skarn Cu ore deposit in Datuanshan are analyzed in accordance with this contrast. The magmatic pluton in Tianmashan is rich in Au and poor in Cu, but that in Datuanshan is rich in Cu and Au. The wallrock strata in Tianmashan contain Au-bearing pyrite layers with some organic substance but those in Datuanshan contain no such layers. Moreover, the ore-forming fluids in Tianmashan are dominantly magmatic ones at the oxide and sulfide stages, but those with high content of Cu in Datuanshan are mainly groundwater fluids. In addition, differences in compositional evolution and physicochemical condition variation of the ore-forming fluids result in gradual dispersion
LEE Hyun Koo
关键词:TONGLING
Zircon geochronology and geochemistry of mafic xenoliths from Liaoning kimberlites:Track the early evolution of the lower crust,North China Craton被引量:3
2004年
Mafic xenoliths from Paleozoic Fuxian kimberlites (Liaoning Province) mainly in- clude garnet granulite, with minor pyroxene amphibolite, meta-gabbro and pyroxene syenite. The SiO2 contents of the xenoliths are from 47.3 wt% to 49.9 wt%. The granulites are mainly coarse-medium grained and reasonably with well-developed granoblastic (mostly polygonal) texture, contain the assemblage of garnet + plagioclase + pyroxene + K-feldspar ±phlogopite. The mineral assemblage of the amphibolites is plagioclase + pyroxene + amphibole ±K-feldspar, with the equilibrium temperature and pressure conditions of 744—821℃ and 0.76—0.88 GPa. The granulites are regarded as derivation from the lower crust depth (more than 29 km), below the amphibolites. Garnet granulites compositionally correspond to sub-alkalic basalt, and have wide ranges of Ni abundance (133—840 ppm), and Nb/Y (0.12—1.85), Nb/U (3.51—53.86) and Ta/U (0.38—2.48). The amphibolite and the syenite correspond to alkalic basalt. The Fuxian ma- fic xenoliths are regarded as the metamorphic product of the underplated magmas (including fractional crystallization or not) experienced the contamination with the pre-existed crustal com- ponents, and partly effected by kimberlitic magmas. The concordant ages of zircons for the gab- bro (2610—2580 Ma) and the near-concordant upper intercept ages of zircons for the garnet granulite and pyroxene amphibolite (2578—2538 Ma) indicate that they are currently known as the oldest deep-seated xenoliths from the lower crust of the North China Craton. These ages recorded the formation of the united Eastern Block of the North China Craton, That is, Neoar- chean (2.6—2.5 Ga) is an important continental crustal growth period of the North China Craton. The lower intercept age of the garnet granulite (1853 Ma) recorded an important tectonic thermal event in Paleoproterozoic. This event was probably related to collision of the East and West block, and resulted in the final assembly of the North China Craton around at 1.8 Ga.
ZHENG Jianping1,YU Chunmei1,LU Fengxiang1 & LI Huimin2 1.Faculty of Earth Sciences,China University of Geosciences,Wuhan 430074,China
关键词:MAFIC
电感耦合等离子体质谱测定地质样品中Pb同位素比值被引量:8
2003年
A simple and precise method for direct determination of molar ratio of 206Pb/ 204Pb, 207Pb/ 204Pb and 208Pb/ 204Pb by ICP-MS was developed. The data acquirement parameters of MS for Quadrupole setting time(QST), Dwell time(DT), Integrated time and number of sweeps were investigated in detail. The relative standard deviation(RSD) of different Pb isotope ratios were less than 0.32%[n=5, ρ(Pb)=20 ng/mL]. The mass discrimination and dead time of detector was calibrated by using NIST981 solution. The mass bias factor(α) of 206Pb/ 204Pb, 207Pb/ 204Pb and 208Pb/ 204Pb were 0 002 5, 0 002 9 and 0 002 0, respectively. The dead time of detector was 7 ns. The proposed method has been applied to the analysis of geological standard reference materials containing AGV-1, BCR-2 and BHVO-2 .The relative error between this work and the recommend values or reported values was better than 0.73% and the relative standard deviation was better than 0.93%(n=5).
胡圣虹杨薇帅琴刘勇胜林守麟高山
关键词:PB同位素比值地质样品地质年代学
Geochemistry of early Paleozoic alkali dyke swarms in south Qinling and its geological significance被引量:5
2003年
The early Paleozoic alkali dyke swarms in the Ziyang-Langao areas of south Qinling are characterized by bimodal volcanic association. They show the patterns of enriched LREE with high fractionation of light and heavy REE and enrichment of incompatible elements in the primitive man-tle-normalized spider-diagrams with peaks of Ba and Nb and valleys of Pb and Sr. The ratios of Ta/Hf are larger than 0.3 and those of Th/Ta less than 1.6, indicating that they were derived from enriched mantle sources closely related to plume. The occurrence of alkali dyke swarm demon-strates an extensional event of crust resulting from deep plume activity in the Qinling orogeny dur-ing early Paleozoic. The rifting extension could not continue due to the short activity of plume. Consequently, no new oceanic basin was formed.
张成立高山张国伟柳小明于在平
关键词:ALKALIDYKE
鲁西中生代闪长岩中两类幔源捕虏体的岩石学和地球化学被引量:43
2003年
鲁西铁铜沟岩体辉石闪长岩中黑云母的^(40)Ar/^(39)Ar坪年龄为132.79±0.27Ma。产于辉石闪长岩中深源捕虏体的岩相学、矿物化学、岩石地球化学和野外资料表明,它们可划分成两组。组Ⅰ为具有变质-变形结构的纯橄岩、方辉橄榄岩和尖晶石二辉橄榄岩类。该类捕虏体耗损易熔元素(如Ca、Al)、橄榄石具有较高的Mg~#值和较高的含量表明它们可能为古老岩石圈地幔高度部分熔融的残留体。然而,相对富集轻稀土元素的配分形式、较高的^(87)Sr/^(86)Sr比值以及交代型金云母的存在暗示着该类捕虏体遭受了晚期交代作用的改造;组Ⅱ为具有残留的嵌晶结构、再平衡结构,并叠加有变形结构的纯橄岩、方辉橄榄岩、橄辉岩和二辉石岩类。该类捕虏体具有较低的Mg~#值和^(87)Sr/^(86)Sr比值以及较高的稀土元素丰度表明可能代表了新增生的岩石圈地幔物质。两类幔源捕虏体的共存对认识华北地块东部中生代岩石圈地幔的性质以及揭示中国东部陆下岩石圈地幔的演化历史具有重要意义。
许文良王冬艳王清海林景仟
关键词:中生代闪长岩岩石圈地幔
东北地区新生代侵入体的锆石激光探针U-Pb年龄测定与稀土元素成分分析被引量:674
2003年
利用LA-ICPMS锆石U-Pb原位定年方法,在不同斑束下对吉林省南部永胜霓霞正长岩获得的年龄与SHRIMP年龄(31 Ma)在准确度和精度上均相当。该年龄也与采自辽东半岛的饮马湾山辉长岩体的年龄在误差范围内基本相同,代表了我国东北乃至整个东部地区出露的最年轻侵入体,指示了渐新世幔源岩浆底侵作用以及该区自30 Ma以来的显著地壳抬升与剥蚀。同时,永胜霓霞正长岩的锆石具有十分高的轻稀土元素含量和平坦的稀土元素配分型式,这种异常的稀土元素配分型式在已发表的文献中尚未见报道,属于一种新的锆石REE配分型式。
袁洪林吴福元高山柳小明徐平孙德有
关键词:新生代侵入体U-PB年龄测定辉长岩正长岩稀土元素
徐淮地区中生代深部地壳的物质组成及热状态——深源捕虏体证据被引量:12
2003年
徐淮地区中生代侵入杂岩中含有丰富的深源岩石捕虏体,包括榴辉岩类、单斜辉石岩、角闪岩类和片麻岩类。深源捕虏体的岩相学研究表明,它们经历了早期的榴辉岩相变质和晚期的角闪岩相退化变质,然后被寄主岩浆所捕获。捕虏体中矿物平衡温压估算结果显示,榴辉岩相变质的温压条件为:T=657~992℃,P=1.33~2.78GPa,所反映的地温梯度介于克拉通地温(40mW/m2)和大洋地温(60mW/m2)之间;晚期角闪岩相退变的温压条件为:T=523~878℃,P=0.5~1.02GPa,这与中国东部新生代地温梯度相一致。本区中生代深部地壳主要由一套混杂堆积岩所构成,包括退变榴辉岩、退变石榴辉石岩、角闪岩类和片麻岩类。该区深源捕虏体的P-T演化暗示中生代早期华北地块东部深部地壳和/或岩石圈地幔曾存在一次重要的加厚过程;苏鲁造山带的形成可能是扬子地块沿北西方向俯冲于华北地块之下的产物;中生代郯庐断裂带并不存在巨大左行平移。
王清海许文良王冬艳林景仟高山
关键词:中生代深源捕虏体深部地壳
不同钵体研磨地质样品产生的元素污染及粒度分布探讨被引量:7
2004年
采用玛瑙钵体碎样,随着研磨时间加长,样品粒度可以变得更细。但与碳化钨钵体相比,达到同样粒度所需研磨时间较长,且清洗困难,会造成样品之间的污染。用碳化钨钵体碎样,粒度在研磨4min后可达到70μm,但研磨5min和6min,粒度无明显变细。在两种钵体中,除碳化钨钵体对样品造成了严重的Co污染外,对所测定的其它微量元素,均未造成明显污染。
柳小明刘晔王建其高山
关键词:地质样品粒度分布污染
鲁西中生代金岭闪长岩中纯橄岩和辉石岩包体的发现及其意义被引量:27
2003年
鲁西中生代金岭岩体闪长岩中含有众多的深源捕虏体,主要为纯橄岩和辉石岩.其中纯橄岩又可分为两亚类,一类具板状结构,橄榄石的Mg#值(93-94)高;另一类具变质变形结构,并叠加有矿物反应结构,橄榄石的Mg#值(86-87)低.矿物化学表明前者可能来源于古老的岩石圈地幔,后者曾遭受过富硅钾质熔体的改造.辉石岩中矿物出溶结构的存在、辉石较高的Mg#值以及较高的平均衡温度均暗示该类捕虏体可能为中生代幔源岩浆在上地幔顶部或壳幔边界附近形成的堆积体.
许文良王冬艳高山林景仟
关键词:中生代闪长岩纯橄岩辉石岩包体矿物化学
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