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161.
162.
Metamorphic zircon from Xindian eclogite,Dabie Terrain: U-Pb age and oxygen isotope composition 总被引:2,自引:1,他引:2
E. Deloule 《中国科学D辑(英文版)》2006,49(1):68-76
~~Metamorphic zircon from Xindian eclogite,Dabie Terrain: U-Pb age and oxygen isotope composition@E. Deloule$CRPG-CNRS Nancy,54501,France1. Vavra, G, Gebauer. D., Schmid. R. et al., Multiple zircon growth and recrystallization during polyphase Late Carboniferous to Tri-assic metamorphism in granulites of the Ivrea Zone (Southern Alps): an ion microprobe (SHRIMP) study, Contrib. Mineral Petrol., 1996, 122:337-358
2. Vavra, G, Schmid, R., Gebauer, D., Internal morphology, ha… 相似文献
163.
Z.-F. ZHAO Y.-F. ZHENG T.-S. GAO Y.-B. WU B. CHEN F.-K. CHEN F.-Y. WU 《Journal of Metamorphic Geology》2006,24(8):687-702
Fluid availability during high‐grade metamorphism is a critical factor in dictating petrological, geochemical and isotopic reequilibration between metamorphic minerals, with fluid‐absent metamorphism commonly resulting in neither zircon growth/recrystallization for U‐Pb dating nor Sm‐Nd isotopic resetting for isochron dating. While peak ultra‐high pressure (UHP) metamorphism is characterized by fluid immobility, high‐pressure (HP) eclogite‐facies recrystallization during exhumation is expected to take place in the presence of fluid. A multichronological study of UHP eclogite from the Sulu orogen of China indicates zircon growth at 216 ± 3 Ma as well as mineral Sm‐Nd and Rb‐Sr reequilibration at 216 ± 5 Ma, which are uniformly younger than UHP metamorphic ages of 231 ± 4 to 227 ± 2 Ma as dated by the SHRIMP U‐Pb method for coesite‐bearing domains of zircon. O isotope reequilibration was achieved between the Sm‐Nd and Rb‐Sr isochron minerals, but Hf isotopes were not homogenized between different grains of zircon. The HP eclogite‐facies recrystallization is also evident from petrography. Thus this process occurred during exhumation with fluid availability from decompression dehydration of hydrous minerals and the exsolution of hydroxyl from nominally anhydrous minerals. This provides significant amounts of internally derived fluid for extensive retrogression within the UHP metamorphosed slabs. Based on available experimental diffusion data, the consistent reequilibration of U‐Pb, Sm‐Nd, Rb‐Sr and O isotope systems in the eclogite minerals demonstrates that time‐scale for the HP eclogite‐facies recrystallization is c. 1.9–9.3 Myr or less. This provides a maximum estimate for duration of the fluid‐facilitated process in the HP eclogite‐facies regime during the exhumation of deeply subducted continental crust. 相似文献
164.
Yong-Jiang Liu Franz Neubauer Johann Genser Akira Takasu Xiao-Hong Ge Robert Handler 《Island Arc》2006,15(1):187-198
Abstract Pelitic schists from Qingshuigou in the Northern Qilian Mountains of China contain mainly glaucophane, garnet, white mica, clinozoisite, chlorite and piemontite. Isotopic age dating of these schists provides new constraints on the formation of the high-grade blueschists at Qingshuigou. White mica 40 Ar/39 Ar ages range from 442.1 to 447.5 Ma (total fusion age of single grain) and from 445.7 to 453.9 Ma (integrated age of white mica concentrates). These ages (442.1–453.9 Ma) represent the peak metamorphic ages or cooling ages of the blueschists during exhumation shortly after peak metamorphism. The 40 Ar/39 Ar dates in the present study are similar to ages previously reported for eclogites and blueschists in the area; this suggests that both the eclogites and pelitic sediments underwent high-grade metamorphism during the same subduction event. From this chronological evidence and the presence of well-developed Silurian remnant-sea flysch and Devonian molasse, it is concluded that the Northern Qilian Ocean had closed by the end of the Ordovician, and rapid orogenic uplift followed in the Devonian. 相似文献
165.
大别高压和超高压榴辉岩中绿辉石的透射电镜研究 总被引:1,自引:0,他引:1
近年来有关大别山超高压变质岩的研究取得了重要进展。但对榴辉岩的显微和超微构造的研究仍然不足。榴辉岩主要由石榴石和绿辉石组成,其中石榴石基本上相当于刚性体,除非在很高温条件下石榴石才发生韧性变形[1~4]。因此,笔者对高压和超高压榴辉岩中的绿辉石进行了... 相似文献
166.
苏北榴辉岩成因类型及其形成条件 总被引:5,自引:0,他引:5
苏北榴辉岩至少存在高压壳源型(H型)、超高压壳源型(U型)和幔源型(M型)三类。其中H型榴辉岩的石榴石为铁铝榴石,具正环带结构,单斜辉石属低硬玉绿辉石,主要形成于晋宁期低温高压变质条件下的下地壳;U型榴辉岩含微粒金刚石(?)、柯石英及其假象等,发育放射状胀裂结构和正、反环带结构,石榴石为钙铝榴石,单斜辉石属高硬玉绿辉石,主要形成于印支期高温超高压变质条件下的上地幔;M型榴辉岩的石榴石属镁铝榴石,形成于晋宁期高温超高压条件下的岩石圈与软流圈交界附近。 相似文献
167.
苏北榴辉岩成因型及其形成条件 总被引:4,自引:0,他引:4
苏北榴辉岩至少存在高度压壳源型(H型)、超高压壳源型(U型)和幔源型(M型)三类。其中H型榴辉岩的石榴石为铁铝榴石,具正环带结构,单斜辉石属低硬玉绿辉石,主要形成于晋宁期低温度高压变质条件下的下地壳;U型榴辉岩含微粒金刚石(?)、柯石英及其假象等,发育放射状胀裂结构和正、反环带结构、石榴石为钙铝榴石、单斜辉石属高硬玉绿辉石,主要形成于印支期高温超高压变质条件下的上地幔;M型榴辉岩的石榴石属镁铝榴石 相似文献
168.
华中榴辉岩域的岩浆型榴辉岩及其形成机制 总被引:5,自引:0,他引:5
中国中部鄂豫皖苏鲁的榴辉岩分布面积约达50000km^2,构成地球上一个罕见的宏大的榴辉岩域。榴辉岩的主要围岩是长曲质片麻岩,它与榴辉岩不是相同高压变质作用的产物。 相似文献
169.
The occurrence,mineralogy and geochemistry of eclogites in the Mt.Dabie area show that they were subjected to a high-pressure metamorphism together with the country rocks,but their petrochemistry and REE geochemistry show some difference from those of the country rocks.The geochemical characteristics of the eclogites are similar to those of bot continental tholeiitic basalt and oceanic tholeiitic basalt.The rocks probably subducted to the upper mantle with the Dabie metamorphic complex.When elevated to the surface,they were subjected to different staes of retrogressive metamorphism. 相似文献
170.