白头山区冰川地貌航空卫星照片解译

通过解译,首次在吉林省白头山下发现了巨大的冰碛扇裙、冰水扇裙和叠加其上的冰碛垄、蛇形丘、中碛、侧碛等;在火山锥体上发现了若干冰斗、冰窖、冰蚀环谷、基岩鼓丘、葫芦谷等冰蚀冰碛地貌,同时对火口内前人已报导过的冰斗、冰窖,根据其相互叠加关系进行了划分和成生探讨。根据火山锥体表面及其外围若干冰蚀冰碛地貌的空间组合及其相互关系,并充分考虑到区内新构造运动的影响、流水侵蚀和重力崩塌等的协从作用,在此基础上分析探讨了区内冰川作用的若干规律性问题。     

河北蓟县常州沟组宇宙尘落地年龄

河北蓟县常州沟组铁质宇宙尘,形状多样,具气印、球粒、壳层和骸晶等多种结构。含钴、富硅、低镍。由磁铁矿、方铁矿、铁纹石、铁橄榄石等矿物组成,属陨石消融型。~(40)As/~(39)Ar阶段加热年龄谱呈单调上升型式,给出1670Ma形成年龄和170Ma热扰动时代。     

大陆碰撞造山带复合叠加型岩石圈热结构——以云南三江地区为例

在获得云南一批大地热流、岩石放射性生热率数据的基础上,结合研究区地质—地球物理资料,提出并建立了云南三江地区大陆碰撞造山带复合叠加型岩石圈热结构模式。这一模式有助于了解云南三江地区三叠纪以来构造作用产生的深部热背景,从地热学角度探讨了区内岩浆岩、火山岩和变质岩的分布规律。     

Multi-level Detachments and Petroleum Potential of the Tarim Basin

Four detachment systems have been found in the Tarim Basin. They are made up of the Proterozoic,Palaeozoic, Mesozoic-Eogene and Neogene-Quaternary, respectively. The shallow-level detachments are char-acterized by the occurrence of fold-thrust belts in the Meso-Cenozoic. The mid-level detachments are markedby nappes, decollement folds and drag anticlines in the Palaeozoic. The deep-level detachments are representedby ductile shear belts in the basement. Mid-and deep-level detachments mainly occur in the Northern, Centraland Southern Uplifts which are major hydrocarbon accumulation belts of large-scale oil fields. Shallow-leveldetachments mainly exist in the Kuqa, Southwestern and Southeastern Depressions, which are favourable beltsfor finding medium- and small-sized oil-gas fields.     

天然放射性碳年代测定(二)

本报告公布的系1975年至1976年用乙炔（C₂H₂）气体计数法和1977年底用液体闪烁计数法测定的部分地质样品年代数据。另外,为了验证液体闪烁计数法的可靠性,用液体闪烁计数法又测定了湖南长沙马王堆两个考古样品,在此也再次公布测定结果。     

On Geophysical Background of Superlarge Deposits in the Chinese Continent

Based on the study of tens of geophysical profiles (seismic, geothermal flow and magnetotelluric sounding profiles) and 3-D shear wave velocity structures of the Chinese continent and its neighbouring regions, this paper describes the 3-D crustal and upper mantle structures and discusses briefly the deep geophysical background of superlarge ore deposits in the Chinese continent. Superlarge deposits are usually very few in number, but they are distributed still in certain forms such as "point", "zone" and "area". Most of the large-, medium- and small-sized deposits occur near the margins of different tectonic units; while the superlarge endogenic polymetallic deposits occur mostly in thinned mantle lithosphere, uplifts of the asthenosphere (vertical low-velocity zones) and the transformation zones of lateral inhomogeneity (weak zones) in the upper mantle. The superlarge endogenic polymetallic deposits are almost unevenly distributed in three major ore zones in China, corresponding to the boundaries of in     

Geology, Geochemistry and Origin of the Hongshan Porphyry-Cryptoexplosive Breccia Type Copper Deposit in Huichang County, Jiangxi Prvince

The Hongshan porphyry-cryptoexplosive breccia type copper deposit occurs in a metamorphic rockseries of the Mesoproterozoic Zhongcun Group. Orebodies are distributed inside and outside porphyry-cryptoexplosive breccia pipes. The deposit involves five ore-forming types, Le the porphyry type, crytoexplosivebreccia type. contact-zone veinlet-disseminated type, in-pipe fracture-zone filling-replacement type and out-of-pipetracture-zone filling-replacement type, forming an ore-forming system of "five ore-forming types within a singlerock body" Fluid inclusion and isotope geochemical studies indicate the following: S, Pb, O and Sr were derivedfrom the lower crust, Nd was derived from the continental crust or depleted mantle and rare earth elements (REE)and trace elements have the crustal source characters; fluids consist dominantly of formation water, metamorphic wa-ter and meteoric water with a part of magmatic mater; heat came from porphyry while the latter originated from par-tial melting caused by shear heating in the lower crust and upper mantle. According to its origin the deposit is classi-fied as the hypabyssal and near-surface, meso-and hypothermal copper deposit ussociated with the late Yanshanianporphyry-cryptoexplosive breccia.     

景泰-天祝断裂单元与多重特征地震的危险性概率评估

基于景泰 -天祝断裂的大比例活动构造填图资料 ,建立了合理的破裂分段地质模型。在此基础上 ,采用地震危险性分析的“实时模型”并考虑断层段之间的相互作用 ,对景泰 -天祝断裂的大震危险性概率作了定量评估。所得结果认为 ,景泰 -天祝断裂的下次大震很可能是毛毛山与金强河两个单元破裂段的组合破裂 ,震级约MS7 5。未来 10 ,2 0 ,5 0 ,10 0a内最可能的发震概率分别是 14%、2 7%、5 6 %和 81%     

贵州省六枝县郎岱“法郎组”的牙形石及其时代意义

本文描述了采自贵州省六枝县郎岱剖面“法郎组”的一些牙形石,该牙形石群主要由Paragondolella polygnthiformis,P.maantangensis,P.tadpole,P.navicula navicula,P.foliata foliata,P.foliata inclinata,P.jiangyouensis,P.langdaiensis Yang sp.nov.等组成,自下而上可识别出3个牙形石带,竹杆坡组Pargondolella polynathiformis-Paragondolella maantangensis组合带、Paragondolella polygnathiformis-Paragondolella tadpole组合带,瓦窑组Pragondolella polygnathiformis带,因此,该剖面“法郎组”的时代,不仅上部（当前的瓦窑组）,而且下部（当前的竹杆坡组）,都是晚三叠世卡尼期的。     

湖南省桃江-城步断裂带北东段锑矿成矿规律及找矿模型

桃江-城步断裂带是湘中"拗拉槽"中主要复活断裂之一,由于多期复活,因此具有规模大、切割深、控岩控矿明显的特点,为湘中地区重要的控矿断裂带.北东段即指南西自安化廖家坪,北东至桃江板溪的走向长度约40 km的地段,该段主要切割了雪峰期及加里东期两个构造层,并有中-大型规模脉状锑矿产出,而正是这些脉状锑矿逐渐改变湘中锑矿储量的比例,通过对该锑矿类型、特征、控矿构造组合型式、锑矿成矿规律、成矿-找矿模型的研究,提出了新的认识,并根据所建模型预测了大福坪锑矿和廖家坪金矿,经验证分别达到了中型及大型规模.