冀北东段中生代火山盆地铀成矿条件分析及远景评价     

陈志勇  洪永勇  卢新堂 《铀矿地质》1993,(5)

冀北东段是燕辽成矿带中有成矿远景的地区,不仅对铀成矿有利,同时又是金、多金属成矿的有利地区。工作区地处华北地台北缘东段,位于中生代构造活动带的边缘及多期构造活动带的叠加部位,形成各具特色的双层构造层,且有多期构造岩浆活动,形成有利的矿源层(体)。这些多期热改造事件,使成矿元素具备活化富集的条件。本文在分析区域地质背景及成矿条件的基础上提出3条成矿带及一片成矿有利远景区,并提出金成矿规律及找矿方向。  相似文献   

1987年在美国亚利桑那州北部和邻近的犹他州大峡谷地...     

Finch  WI 卢新堂 《国外铀金地质》1991,(1):76-85

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铀资源评价和勘探的品位与吨位模型     

Finch  WI 卢新堂 《国外铀金地质》1991,(4):78-84

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Direct evidence of transformation from smectite to palygorskite: TEM investigation   总被引：3，自引：0，他引：3  

CHEN Tianhu  XU Huifang  LU Anhuai  XU Xiaochun  PENG Shuchuan &YUE Shucang .College of Resources  Environmental Engineering  Hefei University of Technology  Hefei  China  .Department of Geology  Geophysics  University of Wisconsin  Madison  WI  USA  .Department of Geology  Peking University  Beijing  China Correspondence should be addressed to Chen Tianhu 《中国科学D辑(英文版)》2004,47(11):985-994

Palygorskiteusuallyisonlyaminorcomponentofmodernsedimentsandsoils.Onlyinspecificenvi-ronmentscanitoccurinlargeamountsandformeco-nomicaldeposits.Inspiteofitsscarcity,thismineralhasbeenrecordedinnumerousenvironments,rangingfromdeepseaandperitidalflatstosoilsandlacustrinesedimentaryrock[1—4].Palygorskiteinsedimentaryrocksandsoilscanbeofthreedifferentorigins:inherited,detritalandauthigenic[5].Theformationmechanismsofauthigenicpalygorskitearestillcontroversial,andvariousproc-esseshavebeenproposedf…  相似文献   

The Development and Initial Tests of an Atmospheric Model Based on a Vertical Coordinate with a Smooth Transition from Terrain Following to Isentropic Coordinates     

DRJohnson  Zhuojian YuanSpace Science  Engineering Center University of Wisconsin-Madison W. Dayton Street Madison  WI  U. S. A 《大气科学进展》1998,(3)

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