新疆北部古生代大陆增生构造

古生代亚洲中部是一幅两陆夹一洋、洋中多地体的构造图案，大地构造框架与现代西南太平洋格局十分相似。中亚造山带是晚古生代复杂地体的拼贴带。新疆北部古生代存在4类成因的8个地体构造。它们以裂解陆块地层块体、海山和火山弧的形式散布在中蒙大洋中，诸地体间是一系列的小洋盆。晚古生代，这些地体开始彼此拼贴并导致强烈推覆作用。石炭纪末－二叠纪初，中蒙大洋闭合，散布其中的诸地体分别增生到塔里木大陆北缘和西伯利亚大陆南缘。北天山－准噶尔地区6条蛇绿岩带记录了诸地体间碰撞事件。     

长江中下游成矿带区域构造格局的新认识

长江中下游成矿带作为我国重要的成矿带之一,矿产资源开发利用及区域地质研究历史悠久,成果丰硕。本文重点论述了长江中下游成矿带的构造格局和复合构造系统,探讨了董岭/埤城式基底与江南式基底的拼合时代,提出了南北对峙带的概念,明确了江南过渡带的内涵。主要认识有:(1)长江中下游成矿带平面构造格局为"一弧一线夹两喇叭"的形态;(2)董岭/埤城式基底与江南式基底的拼合时代介于Z_1与Z_2之间;(3)南北对峙带是"纲",控制了长江中下游成矿带的构造格局;(4)剪切阶段是"眼",区域上由"压扭"向"张扭"的转换过程中成岩成矿大爆发;(5)江南过渡带的南半部早期属于江南隆起,在印支期与下扬子地区一并发生褶皱,褶皱特征类似下扬子坳陷南缘而与江南隆起腹地不同,故划到长江中下游成矿带构造单元中。     

大别-郯庐-苏鲁造山带复合旋转拼贴作用

郯庐断裂带的成生演化与含超高压变质带(UHP)的大别及苏鲁造山带存在较密切的时空关系。郯庐断裂带所在的构造位置应是晚二叠世华北与扬子地块碰撞时的根带。UHP岩石的折返过程可能发生于华北、扬子地块的大角度旋转、拼合过程中。在华北与扬子地块的造山后期或者造山期后的构造变形中所记录的构造形迹经晚中生代以来的中国东部构造变形叠加而逐渐呈现复杂的构造组合,所谓“郯庐断裂带”的走滑平移即其中的一种运动方式。华北与扬子地块碰撞造山作用与陆内变形最终造就了大别—郯庐—苏鲁复合造山带。     

福建省地体构造划分及构造演化

本文根据对福建省不同地区的地质特征进行详细的研究对比,划分出闽西北、闽西南、闽东和闽东南四个性质不同的地体,并研究了各地体的之间碰撞拼贴的历史,指出它们主要经历了三个阶段：1、晚元古代,闽西南地体和闽西北地体沿南平-宁化一线发生碰撞拼贴作用,同时伴随海底和陆上火山喷发活动;2、三叠纪,闽东地体沿政和-大埔一线和闽西南、闽西北地体发生碰撞拼贴作用,闽东南地体也随之拼贴在闽东地体之上;3、白垩纪,闽东南地体沿平潭一东山断裂带发生左行走滑运动。     

A study of the construction times of the ancient cities in Ganjia Basin,Gansu Province,China

The Ganjia Basin in Xiahe County,Gansu Province,China,is located on the northeastern edge of the Tibetan Plateau.The area lies in the transitional zone between the Plateau ethnic groups dominated by ancestral Tibetans,and the Central Plains dynasties dominated by ancestral Han in history.The Ganjia Basin is therefore well suited to studying the history of the intermixing of the Han and Tibetan peoples.In this study,we collected samples of organic materials from two ancient cities,Bajiaocheng(BJC) and Sirougucheng(SRGC),in the Ganjia Basin,which were used for radiocarbon dating.Our aims were to determine the construction times and function of the cities,based on the radiocarbon ages,Bayesian age modeling,and the analysis of relevant historical records.The results are used to discuss the role of the Ganjia Basin in the conflicts between and the integration of the two ethnic groups during the historical period.We conclude that BJC was established during 663–732 CE(Common Era);its early occupation history can be divided into an initial establishment phase(670–780 CE) and a phase of regeneration(880–1030 CE).SRGC was probably built at the time of the transition between the Song and Yuan dynasties(～1271 CE).Combining the dating results with an analysis of the architectural styles and historical records,we conclude that BJC was originally built by the Tubo Kingdom as a military stronghold,and its major functions were military,economic and religious,and to support the major eastward expansion of the Tubo.SRGC was most likely a temple-focused city intended to promote Tibetan Buddhism which was a major political and religious leadership for the Tibetans at that time,reflecting changes in the status of different religions in the Ganjia Basin.In addition,the intermixing and blending of the Han and Tibetan groups,reflected by the human activities in the Ganjia Basin,was an important demographic and cultural foundation for the formation of the culturally-diverse but spiritually-united modern Chinese people.     

Analysis of deformation fabric in an Alkaline Complex (Koraput): Implications for time relationship between emplacement,fabric development and regional tectonics

The Koraput Alkaline Complex (KAC) lies on the NE-SW trending Sileru Shear Zone (SSZ) separating the Proterozoic Eastern Ghats Province from the Archaean Indian craton. The core of the KAC is made of hornblende gabbro, which is rimmed by a band of nepheline syenite in the east and syenodiorite in the west. The timing of magmatism with respect to the SSZ is disputed. The KAC was deformed during emplacement, and a magmatic foliation related to the syn-emplacement deformation, D ₁ , is present in the gabbroic core. The dominant D ₂ -related field fabric strikes NESW and is penetrative in parts of the gabbro and marginal lithologies. E-W trending D ₃ shear zones cut across the complex. Distinct textural domains resulted from strain partitioning during deformation. Parts of the complex with magmatic textures constitute Domain-1, while D ₂ and D ₃ fabric zones comprise Domains-2 and 3 respectively. Temperatures in the KAC initially decreased following D ₁ , but increased through D ₂ and D ₃ . Anisotropy of magnetic susceptibility (AMS) studies show that the magnetic fabric generally follows S ₁ in Domain-1. While the magnetic fabric in Domain-2 is dominantly parallel to S ₂ , some of it parallels S ₁ . The latter is a relict D ₁ fabric that is recognized from AMS analysis but is obliterated in the field, which confirms that the KAC pre-dates the SSZ. The response of magnetic fabrics to temperature and implications of the study for Indo-Antarctica amalgamation are discussed.     

Plate tectonic setting and genetic types of gas (oil)-bearing basins in China

The plate tectonic setting and genetic types of the gas (oil)-bearing basins in China are studied. Based on the history of break-up and amalgamation of Pangea, the three tectonic evolutionary megastages can be divided and the sedimentary basins in China are classified as Palaeowic and Meso-Cenozoic basins. The Palaeozoic gas (oil) bearing basins are mainly located in intracratonic basins, on which different types of Meso-Cenozoic basins are superimposed, and located in cratonic marginal basins and aulacogens destroyed with a slight degree. In contrast, the Mesozoic and Cenozoic gas (oil)-bearing basins mainly formed in extensional foreland and intracontinental shortening flexural basins.     

闽浙赣中生代陆相火山岩系几个问题的探讨

在广泛搜集闽浙赣地区中生代陆相火山岩系同位素年龄资料的基础上,通过对中生代陆相火山岩系的层序及其广泛分布全区的标志性地层(碳酸岩层)、旋迴划分和对比,建立了三省区中生代陆相火山岩系的综合性拼接剖面,阐明中生代陆相火山活动的历史,得出了中生代火山岩浆具有逆向演化的特点。     

拼合的准噶尔盆地基底: 基底火山岩Sr-Nd同位素证据

在详细岩相学、主元素和微量元素研究基础上, 报道了准噶尔盆地基底不同区块火山岩的Sr-Nd同位素和锆石颗粒年龄研究成果, 结合盆地周缘造山带古生代构造史、古生物、沉积建造、火山岩、侵入岩的综合研究成果, 表明准噶尔盆地基底可能由分属哈萨克斯坦板块、塔里木板块(?) 和西伯利亚板块刚性体外围的岛弧体系经构造软碰撞拼合而成, 它们又经历了块体拼合后的构造-岩浆热事件(如基性岩浆底侵作用) 的进一步改造和影响.      

Amalgamation of North China Craton with Alxa Block in the Late of Early Paleozoic: Evidengce from Sedmentary Sequences in the Niushou Mountain, Ningxia Hui Autonomous Region, NW China

华北与阿拉善两个古陆块是何时拼合在一起的,一直是地质界激烈争论的问题.本文报道了宁夏牛首山西南麓出露的泥盆纪与石炭纪地层波痕及斜层理等沉积构造和构造变形方面的新资料,结合前人近年来获得的区域上奥陶纪砂岩碎屑锆石年龄资料,推测华北与阿拉善两个古陆拼合发生在晚奥陶世至泥盆纪早期之间的某一地质时期.