论北秦岭加里东期造山作用

提出北秦岭加里东造山带由华北地块南缘，以未变质—浅变质沉积岩系为主体的前陆褶断带和北秦岭以中—深变质岩系及强烈岩浆活动为特征的山根带两个主要部分组成。认为它自成体系，相应的变质、变形、岩浆作用发育。该造山带是早古生代未秦岭古洋盆沿商丹—桐柏一线俯冲、消减，促使秦岭古岛弧系碰撞华北地块，造成弧后边缘海闭合所致，是显生宙秦岭造山带形成演化进程中的重大构造事件之一。     

Grenvillian orogeny in the Southern Cathaysia Block: Constraints from U-Pb ages and Lu-Hf isotopes in zircon from metamorphic basement

Metamorphic basement rocks in the Cathaysia Block are composed mainly of meta-sediments with different ages. New zircon U-Pb geochronological results from the meta-sedimentary rocks exposed in the Zengcheng and Hezi areas, southern Cathaysia Block, show that they consist dominantly of early Neoproterozoic （1.0-0.9 Ga） materials with minor Paleo- to Mesoproterozoic and late Neoproterozoic （0.8-0.6 Ga） components, suggesting that the detritus mostly come from a Grenvillian orogen. The youngest detrital zircon ages place a constraint on the deposition time of these sediments in Late Neoproterozoic. Zircon Hf isotopic compositions indicate that the Grenvillian zircons were derived from the reworking of Mesoproterozoic arc magmatic rocks and Paleoproterozoic continental crust, implying an arc-continent collisional setting. Single-peak age spectra and the presence of abundant euhedral Grenvillian zircons suggest that the sedimentary provenance is not far away from the sample location. Thus, the Grenvillian orogen probably preexisted along the southern margin of the Cathaysia Block, or very close to the south. Similarity in the ages of Grenvillian orogeny and the influence of the assembly of Gondwana in South China with India and East Antarctic are discussed, with suggestion that South China was more likely linked with the India-East Antarctica continents in Early Neoproterozoic rather than between western Laurentia and eastern Australia.     

西昆仑陆内造山花岗岩特征及构造环境分析 ——以阿卡孜岩体为例

阿卡孜岩体发育在西昆仑地区叶城县境内的阿卡孜大阪北侧。阿卡孜岩体不仅是西昆仑造山带构造演化的产物,也是大规模陆内造山作用开始的标志。通过对其地球化学特征的研究表明,其SiO2含量(63.68%～74.83%)较高,富钾(碱总量8.25%～9.02%)。里特曼指数2.14～3.25,属钙碱性岩系。铝指数在0.97～1.05之间,为铝饱和型花岗岩。其Rb、Th、Ce、Sm富集,Ba、Nb、Hf、Zr及Yb亏损。稀土元素丰度总体偏高(∑REE=(166.14～992.1)×10-6),斜率(La/Yb)N=10.85～30.45,为轻稀土富集型具微弱-强烈Eu负异常(δEu=0.16～0.77)。该岩体的化学成分在S型花岗岩区,微量元素比值K/Rb=206.5～278.1,Rb/Sr=0.72～3.83,Rb/Li=10.98～38.98,均属同熔型花岗岩。综合判定其形成环境为板内同碰撞期—造山晚期,岩体形成时代为古元古代。     

对龙门山南段宝兴-芦山地区构造格局的探讨

龙门山南段宝兴地区存在着多次推覆和多层滑覆现象,以及推覆滑覆叠加样式。该区存在着印支运动的遗迹,推覆构造在大部分地区切割了印支运动不整合面。造山过程经历了褶皱和推覆作用两个阶段,经历了印支期和喜马拉雅期造山运动。     

小陆拼接、多旋回、陆内构造──中国大陆石油地质三根基柱

中国范围内没有洲级古陆，一些小陆块围绕西伯利亚逐步拼合而成大陆。陆块及其间洋壳相继俯冲、碰撞，导致多旋回构造运动和海陆广泛沉积。最能体现中国特色的是后期俯冲碰撞，引发古缝合线重新活跃，板内岩石圈下部俯冲叠接，岩石圈中部拆离、滑脱、叠覆，盖层强烈褶皱和逆掩推覆。山脉上升、盆地下陷。中国东部燕山运动、西部喜马拉雅运动都达到全球陆内构造运动高峰。中国中、西部多期改造盆地和东部燕山期后新生盆地，将成为中国油气勘查的两大目标。     

一种新型的大地构造相模式和弧后碰撞造山

从瑞士阿尔卑斯造山带分析入手，本提出了一种新型的在地构造相模式；即认为世界上绝大多数造山带均为弧后碰撞造山形成，而造山带均由三个大地构造相组成：Ａｌｅｍａｎｉｄｅ ｆａｃｉｅｓ（日耳大地构造相）、Ｃｅｌｔｉｄｅ ｆａｃｉｅｓ（摄尔特大地构造相）和Ｒａｅｔｉｄｅ ｆａｃｉｅｓ（类特大地构造相）。本还列举了几个造山实例，并认为该模式可用于对世界上其它造山带的分析。     

SHRIMP U-Pb zircon age of tuff from the Kunyang Group in central Yunnan： Evidence for Grenvillian orogeny in South China

Whether or not Grenvillian orogeny occurred in South China still remains highly controversial because high-quality,discriminating data are lacking,and therefore,the key to resolve this matter is to find datable volcanic and/or sedimentary rocks related to Grenvillian orogeny. Such rocks are apparently present in the Fuliangpeng Member from the lower-middle part of Kunyang Group in central Yunnan; here the unit is more than 100 m thick and consists of andesitic ignimbrite,tuffite,terrigeous clastic rocks and carbonates. These volcanic rocks,developed south of the Sibao fold-thrust belts,represent the earliest calc-alkaline volcanic activity in late Precambrian time from central Yunnan and are coeval with both a change in sedimentary facies from detritus to carbonates and the beginning of seismite development elsewhere. Two samples for SHRIMP analysis were collected from this volcanic unit. Sample G3-29-2,from the bottom of Fuliangpeng Member,is an ignimbrite,and about 100 zircon crys-tals recovered from it have euhedral shapes and display relatively simple sector zonation under cathodoluminescent (CL) imaging,suggesting a magmatogenic origin. Twenty-five of the zircons were analyzed and a weighed-mean U-Pb age of 1032±9 Ma was obtained. Sample G3-29-3 from uppermost part of Fuliangpeng Member is a tuffite,and many rounded,evidently detrital zircons were recovered. Nine of these zircons were analyzed,and the oldest single-grain U-Pb zircon age is 1938±26 Ma,im-plying that Paleoproterozoic basement developed in Cathaysia. The dating result,combined with the geotectonic research on the Fuliangpeng Member,leads us to conclude that late Mesoproterozoic orogenic volcanic activity occurred in the western part of South China,and that the related collision of Yangtze and Cathaysian cratons was an integral part of the assembly of Rodinia.     

嵩山主峰的形成及演变

对河南嵩山主蜂的形成和演变过程进行了分析讨论.嵩山地区地层的分布、沉积岩的岩性特征、地层闻的接触关系等证据,表明从古生代直至中生代嵩山并不存在.通过对嵩山山前新生代沉积盆地沉积和作为嵩山断块山和山前断陷盆地分界的君召-太后庙断层构造岩带的研究,证明现今的嵩山应当是在印支-燕山运动中孕育,在喜马拉雅运动中出生并长高的山脉.嵩山的成长过程可分为孕育、幼年、童年和青年阶段.嵩山在形成后主蜂不断向北推移,推移距离达6.5 km,隆起的铅直高度在7 km以上.嵩山和中国大地其他山脉,如喜马拉雅山、天山、昆仑山、秦岭等,是同一辈份的年青山脉.     

河南省洛宁县龙王庙金矿地质特征及矿床成因

河南省洛宁县龙王庙金矿是熊耳山银金多金属成矿带新发现的金矿床．对龙王庙金矿地质特征、物探异常特征、矿床成因及成矿时期进行分析．该矿床形成于中生代华北板块与扬子板块碰撞造山期,矿床类型属基于A型俯冲建立的CMF模式下的造山型热液矿床．矿床的产出受北东向断裂的控制．矿区物探异常显示该区具有较大的找矿潜力,验证钻孔证实M1异常为K1矿体在深部的矿化信息显示．