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U-Pb zircon geochronology and Hf isotope study of metamorphosed basic-ultrabasic rocks from metamorphic basement in southwestern Zhejiang:The response of the Cathaysia Block to Indosinian orogenic event

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Science China Earth Sciences 2008年第6期51卷 788-800页

作者： XIANG Hua ZHANG Li ZHOU HanWen ZHONG ZengQiu ZENG Wen LIU Rui JIN Song State Key Laboratory of Geological Processes and Mineral Resources Faculty of Earth SciencesChina University of GeosciencesWuhan 430074China State Key Laboratory of Continental Dynamics Northwest UniversityXi’an 710069China

A combined study using LA-ICP-MS U-Pb dating, Hf isotopes, trace elements and the Ti-in-zircon geothermometer was carried out on zircons from the metamorphosed basic-ultrabasic rocks in the metamorphic basement of the Cathaysia Block, southwestern Zhejiang Province. The formation and metamorphic ages of the rocks from the metamorphic basement of the Cathaysia Block were determined based on zircon U-Pb geochronology. The age for the magmatic crystalline zircons from the protolith is about 1.85 Ga. The ε Hf (t) values of the older zircons were from ?7 to ?3, with two-stage model Hf ages (T DM2 LC ) of about 2.9 to 3.4 Ga, indicating that the source material was derived from anatexis and recycling of the Archean crust. The newly formed metamorphic zircons yielded U-Pb ages of 260–230 Ma. The metamorphic temperature calculated using the Ti-in-zircon geothermometer ranged from 610 to 720°C, consistent with the results from petrographic observations, indicating that the Cathaysia Block experienced an amphibolite facies metamorphism during the Indosinian. Results from this study provided an important timeframe for the tectonic evolution in South China and the Southeast Asia during the Late Permian and Early Triassic times.

关键词： U-Pb dating Hf isotopes Ti-in-zircon geothermometer Indosinian orogenics southwestern Zhejiang Province

Metamorphic Temperature Investigation of Coexisting Calcite and Dolomite Marble Examples from Nikani Ghar Marble and Nowshera Formation,Peshawar Basin,Pakistan

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Journal of Earth Science 2016年第6期27卷 989-997页

作者： Muhammad Fahad Yaseen Iqbal Mohammad Riaz Rick Ubic Simon A. T. Redfern Department of Electrical Engineering COMSATS Institute of Information Technology Abbottabad 22010 Pakistan Materials Research Laboratory Department of Physics University of Peshawar Peshawar 25120 Pakistan National Centre of Excellence in Geology University ofPeshawar Peshawar 25120 Pakistan College of Engineering Boise State University Boise 83401 USA Department of Earth Sciences University of Cambridge Cambridge 999020 United Kingdom

Using marble samples from the Nikani Ghar marble and Nowshera Formation from Northern Pakistan the determination of the temperature of metamorphism was undertaken with the help of calcite-dolomite solvus geothermometer. Two types of marbles, that is, calcite-dolomite marble and quartz-bearing calcite-dolomite marble were selected. Petrographic and scanning electron microscope analysis of dolomite samples indicated different grain sizes. X-ray diffraction technique indicated the calcites MgCO3 content up to 7.93 mol.%. Nikani Ghar marble samples have shown lower contents of MgCO3 as compared to samples from Nowshera Formation. The calcite-dolomite-quartz marble has also showed relatively lower MgCO3 content and hence rather low temperature （-500 ℃）. The temperature reached during peak metamorphism of the investigated marble occurrence, based on calcitedolomite solvus was 628 ℃. Metamorphic temperatures derived from the present study were shown as a linear graph and values were in good agreement with the published literature.

关键词： calcite dolomite metamorphic temperature geothermometer X-ray diffraction.

Free Radicals in Organic Matter for Thermal History Reconstruction of Carbonate Succession

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Acta Geologica Sinica(English Edition) 2007年第4期81卷 605-613页

作者： QIU Nansheng LI Huili JIN Zhijun and ZHU Yinkang 1 State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum,Beijing 102249 2 Basin and Reservoir Research Center,China University of Petroleum,Beijing 102249 3 Institute of Petroleum Exploration and Development,SINOPEC,Beijing 100083 State Key Laboratory of Petroleum Resource and Prospecting China Universityof Petroleum Beijing 102249

geothermometer is one of the most useful methods to reconstruct the thermal history of sedimentary basins. This paper introduces the application of free radicals concentration of organic matter as a thermal indicator in the thermal history reconstruction of carbonate succession, based on anhydrous thermal simulation results of type I and H1 kerogen. A series of free radicals data are obtained under thermal simulation of different heating temperatures and times, and quantitative modds between free radical concentration （Ng） of organic matter and time-temperature index （TTI） for types I and type H1 kerogen are also obtained. This *** relation was used to model the Ordovician thermal gradients of Well TZ12 in the Tarim Basin. The modeling result is corresponding to the results obtained by apatite fission track data and published data. This new method of thermal history reconstruction will be benefit to the hydrocarbon generation and accumulation study and resource assessment of carbonate succession.

关键词： carbonate succession geothermometer free radicals of organic matter apatite fission track thermal history

Occurrence of mixed-layer illite/smectite at temperature of 285℃ in an active hydrothermal system and its significance

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Chinese Science Bulletin 1997年第4期42卷 318-321页

作者： Jl Junfeng, P. R. L. Browne and LIU Yingjun1. Department of Earth Sciences, Nanjing University, Nanjing 210093, China 2 Geothermal Institute and Geology Department, University of Auckland, New Zealand Department of Earth Sciences Nanjing University Nanjing China Geothermal Institute and Geology Department University of Auckland New Zealand

THE progressive transformation of smectite into illite via mixed-layer illite/smectite (I/S) phases occurs during hydrothermal alteration, burial diagenesis and regional metamorphism. The proportion of illite or smectite (also indicated by their expandability) and ordering of I/S, interpreted by X-ray powder diffraction (XRD) profiles, have long been used as geothermometers in sedimentary basins. It is found that R=1 ordering mixed-layer I/S still exists

关键词： mixed-layer illite/smectite geothermometer hydrothermal system.

CALCULATION OF RESERVOIR TEMPERATURE USING A SiO_2 MIXING MODEL, ZHANGZHOU GEOTHERMAL FIELD, SE CHINA

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Chinese Science Bulletin 1990年第16期35卷 1360-1363页

作者：庞忠和汪集旸樊志成 Institute of Geology Academia Sinica Beijing 100011 PRC

Reservoir temperature is an essential parameter in geothermal exploration, which is usually obtained by using chemical geothermometers. There are more than a dozen of conventional geothermometers, each of which has its own limitation for application. Zhangzhou Geothermal Field is a saline water field, the thermal water chemistry of which

关键词： geothermometer mixing model Zhangzhou Geothermal Field.

ORIGIN ANALYSIS OF GEOTHERMAL WATER AND EVALUATION OF GEOTHERMAL RESERVOIR TEMPERATURE IN THE HENJING AREA, SOUTH JIANGXI PROVINCE, CHINA

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Geotectonica et Metallogenia 1999年第2期23卷 155-165页

作者： Zhang Weimin(East China Geological Institute, Linchuan, Jiangxi 344000, China)

The studies of water, gas and isotope chemistry indicate that the formation of geothermal water in the Henjing area is not related to the magmatic and volcanic sources. The geothermal water mainly derives from the meteoric source, and the gas components originate from the mixing of meteoric, crustal and mantle sources. Moreover, the geothermal water is in a low to moderate temperature geothermal reservoir. The results calculated by the quartz geothermometer and the silicaenthalpy diagram demonstrate that the lowest temperature of geothermal reservoir is in the range 78℃ to 134 ℃ and the highest temperature is in the range 95℃C to 155℃. Based on isotopic data, the possible elevation of recharge water is about 337. 5 m to 743. 6 m, which corresponds to the Wunizhang area.

关键词： Geothermal water geothermal reservoir geothermometer water chemistry gas chemistry isotope chemistry South Jiangxi

Geochemical genesis of geothermal waters from the Longling hydrothermal area, Yunnan, Southwestern China

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Journal of Groundwater Science and Engineering 2015年第3期3卷 213-221页

作者： GUO Qing-hai ZHANG Xiao-bo LIU Ming-liang LI Jie-xiang ZHOU Chao ZHANG Can-hai ZHU Ming-cheng GUO Wei WANG Yan-xin State Key Laboratory of Biogeology and Environmental Geology & School of Environmental Studies China University of Geosciences Hydropower Development Corporation of Upper Yellow River(Ltd.)

Longling is characterized by a wide distribution of hydrothermal areas, among which the Banglazhang hydrothermal system is the most geothermally active. Banglazhang is marked by intensive hydrothermal activities including hot springs, geysers, fumaroles and hydrothermal explosions. The geothermal waters from the Longling region are mainly HCO3-Na type with low but comparable SO4 and Cl concentrations. Calculations based on a variety of chemical geothermometers and a K-Ca geobarometer indicate that the Banglazhang hydrothermal system has much higher subsurface temperature and CO2 pressure compared to the other systems such as Daheba, Dazhulin and Huangcaoba. However, geothermal water samples collected from all these alternative hydrothermal areas are either partially equilibrated with reservoir minerals or are immature. The silica-enthalpy relationships of Banglazhang geothermal waters indicate the presence of a deep geothermal fluid with an enthalpy value and silica concentration of 945 J/g（up to around 220 °C） and 339 mg/L. Our work indicates the Banglazhang area is a promising source in terms of long-term utilization of hydrothermal resources.

关键词： Geothermal water Geochemical genesis geothermometer Geobarometer Deep geothermal fluid Longling Banglazhang

Effect of Temperature upon Fe-Mg Composition of Garnet in Pelitic System

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矿物学报 2013年第S1期33卷 47-47页

作者： LI Ying DU Jianguo XIE Chao ZHOU Zhihua CEA Key Laboratory of Earthquake Prediction (Institute of Earthquake Science China Earthquake Administration) China Earthquake Networks Center

Garnet is an essential phase in a wide range of metamorphic grades. Ratios of Fe and Mg concentrations in garnet have been widely used as a geothermometer for the crystallization, cooling rate and tectonic uplift rate because garnets in natural rocks always show a variety of Fe-Mg compositional partition. Normally, Fe-Mg concentrations of natural garnets vary widely and the Fe-Mg exchange reactions usually occur in a complex chemical system. Effect of pressure and temperature on Fe-Mg compositions of garnet in natural pelitic system was studied experimentally at temperatures of 700 to 780 ℃ and pressures from 21 to 29.4 kbar. The concentrations of FeO and MgO of garnet in the run products showed a linear relation with experimental temperatures. The result provided experimental evidence of Fe-Mg partition trend with temperature in a complex natural rock and therefore improved our understanding in the determinations of metamorphic temperature calculated by garnet geothermometer. Although the accurate geological application of our results requires the knowledge of the effects of other components upon [D(Mg)] and [D(Fe)] which is largely unknown currently, the data provided in this study are useful to build the relation between FeO-MgO contents and temperature, which is useful in the metamorphic temperatures determine of rocks with pelitic composition.

关键词： Fe-Mg partition garnet pelite geothermometer