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陈汉林, LI Zi-long, CHEN Han-lin†, SANTOSH M., YANG Shu-feng
Li et al./J Zhejiang Univ SCI 2004 5 (10): 1180-1182,-0001,():
-1年11月30日
We first report discovery of the spinel-garnet-orthopyroxene granulite with pure CO2 fluid inclusions from the Fuyun region of the late Paleozoic Altay orogenic belt in Central Asia, NW China. The rock is characterized by an assemblage of garnet, orthopyroxene, spinel, cordierite, biotite, plagioclase and quartz. Symplectites of orthopyroxene and spinel, and orthopyroxene and cordierite indicate decompression under UHT conditions. Mineral chemistry shows that the orthopyroxenes have high XMg and A1203 contents (up to 9.23 wt%). Biotites are enriched in TiO2 and XMg and are stable under granulite facies conditions. The garnet and quartz from the rock carry monophase fluid inclusions which show peak melting temperatures of around -56.7℃, indicating a pure CO2 species being presented during the ultrahigh-T metamorphism in the Altay orogenic belt. The inclusions homogenize into a liquid phase at temperatures around 15.3-23.8℃ translating into CO2 densities of the order of 0.86-0.88g/cm3. Based on preliminary mineral paragenesis, reaction textures and petrogenetic grid considerations, we infer that the rock was subjected to UHT conditions. The CO2-rich fluids were trapped during exhumation along a clockwise P-T path following isothermal decompression under UHT conditions.
UHT granulite,, Petrology,, Pure CO2 fluid inclusion,, Altay orogenic belt,, NW China
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【期刊论文】高温高压下不同类型糜棱岩纵波速度“软化点”特征及其产生机理*
陈汉林, 杨树锋, 陈汉林**, 董传万, 程晓敢, 翟双猛, 齐德文
自然科学进展,2002,12(3):282~286,-0001,():
-1年11月30日
在模拟地下某一深度范围的温度和压力条件下,测量了糜棱岩的纵波速度,并对样品进行电子探针研究。测量结果表明,不同的糜棱岩出现纵波速度“软化点”的温压条件不同,与之相对应的模拟深度分别为:糜棱岩化石英闪长岩,25km左右;石英闪长质超糜棱岩,27km左右;长英质超糜棱岩,33km左右。指出了纵波速度“软化点”的出现与糜棱岩中矿物部分熔融有密切关系,糜棱岩矿物组成中云母矿物对熔体的贡献最大,而长石和石英的贡献较小。分析表明,糜棱岩中云母类含水矿物含量越高,脱水程度越大,部分熔融程度也越大,纵波速度“软化点”出现的深度越小。
糜棱岩 高温高压纵波速度 ", 软化点", 含水矿物脱水 部分熔融
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陈汉林, LI Zilong, CHEN Hanlin, YANG Shufeng, DONG Chuanwan, XIAO Wenjiao, LI Jiliang, YE Yingt and WANG Jian
ACTA GEOLOGICA SINICA Feb. 2004 Vol. 78 No.1 177-185,-0001,():
-1年11月30日
Altay granulite (AG), which represents the product of high-grade metamorphism in the lower crust, was newly found in the Wuqiagou area, Fuyun County in the Altay orogenic belt, Northwest China. It is composed mainly of hypersthene, augite, basic plagioclase, amphibole and brown biotite. Its mineral compositions of amphibole and biotite are rich in Mg/(Mg+Fe2+) and Ti. Geochemically, the AG is enriched in Mg/(Mg+Fe2+) and A1203, and poor in CaO, with depletion of U, Th, K and Rb contents. Furthermore, geochemical data reflect that the protolith of the AG is igneousgenetic calc-alkaline basalt formed under an island arc environment. The AG has +REE of 92.38-96.58 ppm and enriched LREE model with weak positive Eu anomaly of 1.09-1.15. In the MORB normalized spider diagram, the AG shows tridoming pattern with a strong negative Nb anomaly aud medium negative P and Ti anomalies, reflecting that the AG has tectonic relation with subduction or subduction-related materials, The P-Tconditions of peak metamorphism of the AG are 750-780℃ and >0.6-0.7GPa. Retrograde metamorphism implies that the protolith of the Altay granulite might undergo a metamorphic process along a clockwise P-T trajectory. Therefore, the formation and evolution of the AG may have a genetic association with continental collision/orogeny and the AG was taken into the Late Paleozoic meta-strata by way of tectonic emplacement.
granulite,, protolith and tectonic setting,, P-T condition,, genetic mechanism,, Altay orogenic belt,, Northwest China
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陈汉林, 何光玉, 杨树锋, 肖安成, 程晓敢
石油学报,2004,25(6):18~22,-0001,():
-1年11月30日
对河西走廊西段及邻区的地震剖面进行了解释,结合钻井资料对其早白垩世时期的沉积与构造特征进行了系统分析,对盆地的原型进行了新的厘定。在早白垩世时期,该区中部并未发育宽台山O黑山隆起与天泉寺O合黎山隆起,原酒西盆地与花海、酒东和金塔盆地应同属统一的酒泉盆地。其中,原花海、酒西盆地应同属统一的酒西坳陷,内含青西、赤金、石大O花海3个凹陷,后者又可以进一步分为花海次凹、石北次凹和大红圈次凹。原金塔、酒东盆地应同属统一的酒东坳陷,内含金塔、盐池、营尔和马营4个凹陷。2个大坳陷间以嘉峪关隆起作为分隔,而原始盆地的南部边界应位于现今边界以南30~50km处。
酒泉盆地, 盆地原型, 早白垩世, 河西走廊, 构造特征
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陈汉林, 杨树锋, 武光海, 董传万
地质科学,1995,30(2):105~116,-0001,():
-1年11月30日
利用岩石化学、地球化学、年代学等方法对福建政和地区火山岩系列进行综合研究,确定其为早古生代的岛弧拉斑玄武岩一钙碱性火山岩组合的岛弧火山岩系,揭示了自浙江龙泉经福建政和、建瓯、南平、将乐、赣南延入广东和平、台山、开平一带存在一条早古生代岛弧火山岩系。结合前人的资料对本区早古生代岛弧的形成和演化作了探讨。
早古生代岛弧 火山岩 拉斑玄武岩系列 钙碱性系列 大地构造演化 闽北
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