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Well Logging Responses of UHP metamorphic rocks from CCSD Main Hole in Sulu Terrane,Eastern Central China

Journal of Earth Science 2010年第3期21卷 347-357页

作者：骆淼潘和平 Institute of Geophysics & Geomatics China University of Geosciences Wuhan

The lithologies of the Chinese Continental Scientific Drilling main hole （CCSD-MH） are mainly comprised of orthogneiss,paragneiss,eclogite,amphibolite,and ultramafic *** statistical results of logs of CCSD-MH indicate that ultramafic rocks are characterized by very high CNL （neutron log） and very low GR （gamma ray log） and RD （resistivity log）;eclogites are characterized by high DEN （density）,VP （P-wave velocity） and PE （photoelectric absorption capture cross section）;orthogneiss and paragneiss are characterized by high GR,U （uranium content）,Th （thorium content）,K （potassium content） and RD,and low DEN,PE,and CNL;logging values of amphibolite are between the logging values of eclogites and *** addition,the logs could reflect the degree of retrograde metamorphism of *** upper section （100-2 000 m） shows higher DEN,PE,VP,and lower GR,U,Th,K,RD than the lower section （2 000-5 000 m）.Most logs of the upper section are more fluctuant than those of the lower *** indicates that the upper section has more heterogeneities than the lower *** cross plots of logs indicate that DEN,GR,K,and CNL are more powerful in identifying ultrahigh pressure metamorphic （UHPM） rocks at the *** value of the rocks from CCSD-MH shows obviously an increasing trend from ultramafic rock （the most mafic rocks at CCSD-MH） to orthogneiss （the most acid rocks at CCSD-MH）.On the contrary,DEN value decreases from the ultramafic rock to the *** log is a good indicator of the content of structure water in crystalline rocks.

关键词： ultrahigh pressure metamorphic rock CCSD main hole well logging response

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维普期刊数据库

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A Study on the Classification and Well-Logging Identification of Eclogite in the Main Hole of Chinese Continental Scientific Drilling Project

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Journal of China University of Geosciences 2007年第4期18卷 357-365页

作者：景建恩魏文博金胜叶高峰邓明 Key Laboratory of Geo-detection (China University of Geosciences Beijing)Ministry of Education State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences School of Geophysics and Information Technology China University of Geosciences

Eclogite, one of the important lithologies in the main hole of the Chinese Continental Scientific Drilling （CCSD） Project, exists above the depth of 3 245 m and has distinctive responses of gamma-ray, compensating density and neutron well-logging, and so on. In this study, according to the diversities of minerals and chemical components and well-logging responses, edogites are classified from three aspects of origin, content of oxygen, and sub-mineral. We studied the logging identification method for eclogite sub-classes based on multi-element statistics and reconstructed 11 kinds of eclogite. As a result, eclogites can be divided into 6 types using well logs. In the light of this recognition, the eclogite in the main hole is divided into 20 sections, and the distribution characters of all sub-classes of eclogite are analyzed, which will provide important data for geological research of CCSD.

关键词： Chinese Continental Scientific Drilling (CCSD) ultrahigh pressure metamorphic rock eclogite well-logging lithology identification classification.

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维普期刊数据库

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pressure GRADIENT FROM THE CONTRIBUTION OF BOTH GEOTHERMAL AND GRAVITY IN THE LITHOSPHERE

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Geotectonica et Metallogenia 2005年第2期29卷 128-138页

作者： HU Baoqun LU Guxian WANG Fangzhang SUN Zhanxue LIU Chengdong BAI Lihong Institute of Geomechanics Chinese Academy of Geological Sciences Beo＇ing 100081 China Department of Geosciences East China Institute of Technology Fuzhou JX344000 China Faculty of Earth Sciences China University of Geosciences Wuhan Hubei 430074 China

The pressure gradient of the lithosphere is a key to explaining various geological processes, and varies also in time and space similar to the geothermal gradient. In this paper a correlation formula of geothermal gradients and pressure gradients was built with the thermocomprestion coefficients. Based on this formula, the article has studied the relation between the pressure gradients and the geothermal gradients in the lithosphere, and the results indicate that the pressure gradient in the lithosphere is nonlinear, and its minimum value is the lithostatic gradient, and that the pressure gradient of the lithosphere will increase obviously with the contribution of both geothermal and gravity, and could be twice times more than the lithostatic gradient.

关键词： lithosphere pressure gradient geothermal gradient ultrahigh pressure metamorphic rock

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维普期刊数据库

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The pressure Gradient from the Contribution of both Geothermal and Gravity in the Lithosphere

The Pressure Gradient from the Contribution of both Geotherm...

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地壳深部压力状态与地质作用学术研讨会

作者： HU Baoqun, WANG Fangzhang, SUN Zhanxue, LIU Chengdong and BAI Lihong (Department ofGeosciences, East China Geological Institute, Fuzhou, Jiangxi, 344000, E-mail: hubaoqun@*** Faculty of Earth Sciences, China University of Geosciences, Wuhan, 430074)

＜正＞ The pressure gradient of the lithosphere is a key to explain various geological processes, and it varies also in time and space as similar as the geothermal gradient. The paper has built a correlation formula of geothermal gradients and pressure gradients with the thermocomprestion coefficients. Based on this formula, the article has studied the relation between the pressure gradients and the geothermal gradients in the lithosphere, and indicated that the pressure gradient in the lithosphere is nonlinear, and its minimum is the lithostatic gradient, and that the pressure gradient of the lithosphere will increase obviously for the contribution of both geothermal and gravity, can be more than twice times as the lithostatic gradient.

关键词： the lithosphere the pressure gradient the geothermal gradient ultrahigh pressure metamorphic rock

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