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1.
大别山及苏鲁地区微粒金刚石分类及其大地构造意义 总被引:3,自引:1,他引:3
1992年发现大别山首例微粒金刚石之后,又于2003年和2004年在大别山和苏鲁地区的榴辉岩薄片中和榴辉岩的人工重砂中发现了微粒金刚石。本文报道其中尚未发表的7颗,并对2颗较大的薄片中的微粒金刚石和2颗自由晶体金刚石进行拉曼光谱和红外光谱测试。研究结果表明,本区所有微粒金刚石都为IaA和IaB型金刚石的混合体。缺少Ib型金刚石,表明没有人造金刚石的混入。薄片中的金刚石大部分为石榴子石的包裹体,少数产出于颗粒之间,直径为30-180μm。自由颗粒微粒金刚石直径为400-700μm。在大别山北部,不但又一次找到了微粒金刚石,还在石榴子石中发现有单斜辉石、磷灰石和金红石的出溶。这表明北大剐不但是超高压地质体,而且可能是本区俯冲最深的地质体。 相似文献
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大别山超高压榴辉岩带榴辉岩的特征和变质作用 总被引:17,自引:2,他引:17
大别山超高压柯石英榴辉岩带中多处产出含柯石英榴辉岩,岩石中广泛分布柯石英假象。它们产在片麻岩和大理岩中,并有不同的特征矿物组合。与鄂北等地高压型榴辉岩比较,超高压(柯石英)榴辉岩的绿辉石富硬玉组分,而石榴石为一般的富铁铝榴石贫镁铝榴石的石榴石。钙质角闪石和钠钙质冻蓝闪石是超高压(柯石英)榴辉岩中主要的次生角闪石类型。榴辉岩的原岩是陆内拉张过程中形成的广义拉斑玄武岩,它们在中朝一扬子大陆板块汇聚造山的俯冲大地构造背景中,发生渐进变质。变质时地热增温率极低。造山运动后期,榴辉岩随构造运动抬升又经历两阶段迭加变质。 相似文献
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U-Pb zircon ages for the Luzhenguan Complex in northern part of the eastern Dabie orogen 总被引:4,自引:0,他引:4
Wolfgang Siebe 《中国科学D辑(英文版)》2005,48(9):1357-1367
The Dabie Mountain is the collisional orogenic belt between the North China Block and the Yangtze Block. As the eastern segment of the central-China orogenic belt, its tectonic framework is corresponding to the Qinling orogenic belt as a whole[1]. The NHB in northern part of Dabie Orogen is regarded as the joint belt between the Yangtze Block and the North China Block, and roughly corresponds to the north Qinling belt of the Qinling orogenic belt, which separated the Tongbai-Dabie hig… 相似文献
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Shuguang Li Chenxiang Wang Feng Dong Zhenhui Hou Qiuli Li Yican Liu Fang Huang Fukun Chen 《Tectonophysics》2009,475(2):308-317
In order to understand the vertical structure of the Dabie–Sulu ultrahigh-pressure metamorphic (UHPM) belt, common Pb isotopic compositions of omphacites in eclogites and feldspars in gneisses from the Chinese Continental Scientific Drilling (CCSD) project (100–5000 m) have been investigated in this study. Samples from 0 to 800 m (unit 1) in the drilling core have moderately high radiogenic Pb isotopes with small variations of 206Pb/204Pb (16.82–17.38), 207Pb/204Pb (15.37–15.49), and 208Pb/204Pb (37.21–37.72), indicating either high µ (238U/204Pb) or high initial Pb isotope ratios of their protoliths. In contrast, the samples from 1600 to 2040 m (unit 3) and most of samples from 3200 to 5000 m (unit 5) have moderately or very unradiogenic Pb (unit 3: 206Pb/204Pb from 16.05 to 16.46, 207Pb/204Pb from 15.22 to 15.29, and 208Pb/204Pb from 36.68 to 37.48; unit 5: 206Pb/204Pb from 15.52 to 15.69, 207Pb/204Pb from 15.15 to 15.27, and 208Pb/204Pb from 36.48 to 37.20), indicating either low µ or low initial Pb isotope ratios of their protoliths. Pb isotopes of samples from 800 to 1600 m (unit 2) and from 2040 to 3200 m (unit 4) in the drilling core with abundant ductile shear zones are intermediate between those of units 1 and 3 or 5 and display larger variations. Pb isotopes combined with the published oxygen isotope data of the CCSD samples reveal the original positions of the five units before the Triassic continental subduction. Units 1, 3, and 5 as three UHPM rock slabs could be derived from the subducted upper continental crust, upper–middle continental crust and lower–middle continental crust, respectively. The ductile shearing zones in units 2 and 4 could be the interfaces where the detachment and decoupling took place between the upper, upper–middle and lower–middle continental crusts. The detachment between the upper slab and subducting continental lithosphere probably occurred during continental subduction, and the upper slab (unit 1) was uplifted to a shallow depth along the detachment surface by thrusting. Units 3 and 5 may be detached later from the subducted middle and lower crust and uplifted to a shallow level underneath unit 1. The low δ18O values (? 4.0 to ? 7.4‰) [Xiao, Y.-L., Zhang, Z.-M., Hoefs, J., Kerkhof, A., 2006. Ultrahigh-pressure Metamorphic Rocks from the Chinese Continental Drilling Project-II Oxygen Isotope and Fluid Inclusion Distributions through Vertical Sections. Contribution Mineral Petrology 152, 443–458.; Zhang, Z.-M., Xiao, Y.-L., Zhao, X.-D., Shi, C., 2006. Fluid-rock interaction during the continental deep subduction: oxygen isotopic profile of the main hole of the CCSD project. Acta Petrologica Sinica 22 (7), 1941–1951.] in units 2 and 4 suggest that the detachment interfaces could be developed along an ancient fault zones which were the channels of meteoric water activity during the Neoproterozoic. 相似文献
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<正>Objective The Susong complex zone(SCZ)is a relatively lowgrade metamorphic unit mostly with an epidoteamphibolite facies,located in the southernmost part of the Dabie orogen.However,its rock compositions,ages,metamorphic processes and petrogenesis are still 相似文献
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大别山北部蛇绿岩的地球化学制约 总被引:8,自引:1,他引:7
常量元素,微量元素,稀土元素,Nd同位素及氧同位素地球化学特征表明,太别山北部变质镁铁-超镁铁质岩带中存在变质的蛇绿岩,它主要由变质橄榄岩,辉长岩(-辉绿岩?)和基性熔岩三部分组成,其中,变质的基性熔岩的亏损地幔模式年龄tDM/Ma=1036.8~1293.8,εNd(t)=7.2~7.7,表明它可能代表1000Ma左右形成于中等扩张速率(2cm/ad左右)洋盆条件下的洋壳残片。 相似文献