白云石-方解石氧同位素温度计在川东北地区飞仙关组白云岩成因研究中的尝试.doc

白云石-方解石氧同位素温度计在川东北地区飞仙关组白云岩成因研究中的尝试胡作维1黄思静1李志明2张雪花1徐二社2刘涛1(1. 油气藏地质及开发工程国家重点实验室（成都理工大学）, 成都 610059；2.中国石化石油勘探开发研究院 无锡石油地质研究所, 江苏 无锡 214151）摘要 川东北地区三叠系飞仙关组中，作为最重要储集岩的粒屑白云岩和结晶白云岩的形成机制一直都是高度关注的热点问题。在白云岩结构分类、氧同位素分析的基础上，通过白云石-方解石氧同位素温度计获得了川东北地区飞仙关组不同类型白云岩的形成温度，其中大多数计算温度集中分布在40140区间内，结晶白云岩（包括结构类似的过渡岩石类型）和孔洞白云石的计算温度集中分布在相对高温区间，粒屑白云岩和微晶白云岩的计算温度集中分布在相对低温区间，与前人关于流体包裹体、白云岩形成环境等分析结果有较好的一致性。白云石-方解石氧同位素温度计的初步尝试及其获得的计算温度，可望为川东北地区飞仙关组优质白云岩储层的形成机制研究提供有价值的基础资料。关键词 氧同位素温度计;白云岩;飞仙关组;三叠系;川东北地区Preliminary application of the dolomite-calcite oxygen isotope thermometer in studying the origin of dolomite in Feixianguan Formation, Northeast Sichuan, ChinaHU Zuo-wei1, HUANG Si-jing1, LI Zhi-ming2, ZHANG Xue-hua1, XUE Er-she2, LIU Tao11.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China；2.Wuxi Institute of Petroleum Geology, SINOPEC Exploration & Production Research Institute, Wuxi 214151, ChinaAbstract: The natural gas exploration and production of Triassic Feixianguan Formation in Northeast Sichuan play an important role in the Chinese marine oil & gas industry. The origin of oolitic dolomite and crystalline dolomite, which are the most important reservoirs in Triassic Feixianguan Formation, is one of the hot spot problems, and has been received special attention in recent years. Based on the textural classification and oxygen isotope analyses, the temperatures of different types of dolomite samples from Feixianguan Formation of Northeast Sichuan are calculated by the dolomite-calcite oxygen isotope thermometer. Most of the calculated temperatures range over from 40 to 140. The calculated temperatures of crystalline dolomite (including the transitional rock types with the similar texture) and dolomite cement have a relatively high temperature range and the calculated temperatures of oolitic dolomite and micrite dolomite have a relatively low temperature range. These results are consistent with the fluid-inclusion homogenization temperatures and formation environment of dolomite. The preliminary application and the obtained temperatures of the dolomite-calcite oxygen isotope thermometer will provide some valuable basic data for the studies of high-quality dolomite reservoirs in Triassic Feixianguan Formation of Northeast Sichuan.Key words: oxygen isotope thermometer; dolomite; Feixianguan Formation; Triassic; Northeast Sichuan马松岭铜矿区变火山沉积岩系形成环境研究杨钻云1,2 施泽进1钟康惠1陈波1刘珂辛1（1.油气藏地质及开发工程国家重点实验室(成都理工大学),成都 610059；2.四川省冶金地质勘查局606大队,四川 郫县611730）摘要 在搜集前人相关测试数据，对龙门山中段马松岭矿区出露广泛的变火山岩及其准同期变辉绿岩、赋矿火山沉积围岩进行补充采样和测试基础上，通过岩石地球化学研究，认为马松岭矿区变火山-沉积岩系主体为变岛弧钙碱系列，含少量变大洋岛碱性玄武岩和变正常沉积岩，形成环境为张裂岛弧；彭州式铜矿可能是在VMS型矿胚基础上经后期改造而成；与火山沉积岩系准同期的变辉绿岩为岛弧拉斑系列，因受到不断成熟的过渡壳物质混杂，而主体显高铝系列特征。关键词 龙门山中段;彭州式铜矿;马松岭矿区;变火山沉积岩系;变辉绿岩;构造环境Study on the formation environment of metavolcanite-sedimentary rock series in Masongling, Longmenshan, ChinaYANG Zuan-yun1,2, SHI Ze-jin1, ZHONG Kang-hui1, CHEN Bo1, LIU Ke-xin11.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;2.The 606 Team of Sichuan Metallurgy Geology Exploration Bureau, Pixian 611730, ChinaAbstract: Based on the study of previous relevant test data, added sampling and testing on extensively-outcropping metavolcanite and penecontemporaneous diabase, host rocks of volcano-sedimentary in Masongling mining area of mid-segment Longmenshan Mountains, according to research of lithogeochemical, the authors think that the main body of metavolcanite-sedimentary rock in Masongling mining area is calcalkaline series of metamorphic island arc, including a small quantity of alkali basalt and meta-normal sedimentary rock in metamorphic island arc, whose environment is of rifting land arc; Pengzhou type copper deposit maybe developed by subsequent reformation of previous VMS ore deposit; metadiabase which is penecontemporaneous with volcanic-sedimentary rocks series belongs to island arc tholeiitic series. Mixed with transition crust materials continuously, the main body is characterized by high aluminium rock series.Key words: Longmenshan Mountains; Pengzhou type copper ore; Masongling mining area; metavolcanite-sedimentary rock series; metadiabase; tectonic setting黔东凯里三都断裂结构及形成演化李学刚1a杨坤光1a,1b胡祥云1c戴传固2张慧2(1.中国地质大学 a.地球科学学院; b.构造与油气资源教育部重点实验室; c.地球物理与空间信息学院,武汉 430074；2.贵州省地质调查院,贵阳 550005)摘要 通过宏观描述、地震解译、有限应变测量、显微构造分析及包裹体测温等方法对黔东凯里-三都断裂进行了研究。认为凯里-三都断裂是黔东南推覆体的前锋断裂，呈向NWW突出的弧形，总体表现为由数条断层组成的逆冲断裂带，主断裂倾向SEE，为黔南拗陷和雪峰古陆的分界线。断裂带以浅层脆性变形为主，断裂带上盘向NWW推覆的水平位移达1215 km，是多条断层多期挤压、拉张和平移剪切作用叠加的结果。断裂带经历了多期演化过程，燕山期以来的演化历史主要受太平洋构造域控制，早中燕山期为主挤压逆冲阶段、晚燕山期为拉张正滑阶段、喜马拉雅期为再次挤压-定型阶段。关键词 凯里-三都断裂；地球物理；宏观结构；微观变形；均一温度；演化历史Formation and evolution of the Kaili-Sandu fault in East Guizhou, ChinaLI Xue-gang1a, YANG Kun-guang1a,1b, HU Xiang-yun1c, DAI Chuan-gu2, ZHANG Hui21a.Faculty of Earth Sciences,1b.Key Laboratory of Tectonic and Petroleum Resources, Ministry of Education, 1c.Faculty of Geophysics and Geomatics,China University of Geosciences, Wuhan 430074, China;2.Guizhou Academy of Geological Surveying, Guiyang 550005, ChinaAbstract: The Kaili-Sandu fault is the forward fracture of the thrust nappe in Southeast Guizhou. It shows an arcuate thrust-belt bulging to NWW and consists of several faults. The main fault of the Kaili-Sandu fault belt dips to SEE and separates the South Guizhou depression from the Xuefengshan uplift and is characterized by the brittle deformation. The horizontal displacement of the hanging wall of the Kaili-Sandu fault thrusting to NWW is about 1215 km. This is the result of numerous faults multi-stage compression, extension and strike slip shearing movements. The Kaili-Sandu fault belt has undergone multi-tectonic movement, mainly controlled by the Pacific tectonic domain since Yanshanian. Early and middle Yanshanians are the main compression and thrusting stages, late Yanshanian is the extension and slipping stage, and Himalayan is the compression and final structure-shaping stage.Key words:Kaili-Sandu fault; geophysics; macroscopic structure; microscopic deformation; homogenization temperature; evolutionary history安徽芦岭煤矿88采区瓦斯地质规律王麒翔1,2董国伟1,2崔俊飞1,2覃木广1,2 陈敏3（1.瓦斯灾害监控与应急技术国家重点实验室,重庆 400037;2.中煤科工集团重庆研究院,重庆 400037; 3.重庆地质矿产研究院,重庆 400043）摘要 根据构造、层序、瓦斯压力、瓦斯含量、瓦斯涌出量等多因素分析了安徽省宿州市芦岭煤矿88采区瓦斯地质规律，并建立了运动学模型和压力梯度计算模型。芦岭煤矿区域构造上由于徐宿弧形构造和双重构造2方面因素，造成其相对于临宿矿区其他矿井的构造应力更集中，瓦斯压力较大、含量较高，突出灾害危险性严重。层序上，芦岭矿井第8煤层发育在最大海泛面时期，为层序内最厚的稳定煤层，顶底板圈闭性良好，瓦斯富集。88采区以采区中部的F14正断层为界划分为东、西2个瓦斯地质单元，分别具有不同的瓦斯压力梯度。东部瓦斯地质单元是F14断层下盘， 海拔高度较高但瓦斯压力高，而西部单元（断层上盘）海拔高度较低但瓦斯压力低，与正常瓦斯地质规律相反，初步分析与正断层F14上盘煤层顶板在拉张运动过程中被破坏有关。关键词 芦岭煤矿；瓦斯地质；断层；顶板；煤与瓦斯突出Gas-geology principle of 88 mining area in the Luling coal mine, Anhui, ChinaWANG Qi-xiang 1,2， DONG Guo-wei 1,2， CUI Jun-fei1,2， QIN Mu-guang 1,2， CHEN Min31.State Key Laboratory of Gas Disaster Monitoring and Emergency Technologies, Chongqing 400037, China;2.Chongqing Research Institute, China Coal Technology &Engineering Group Corp, Chongqing 400037, China;3.Chongqing Institute of Geology and Mineral Resources, Chongqing 400043, ChinaAbstract: According to structure geology, sequence stratigraphy, gas pressure, gas content, gas emission and other factors, this paper analyzes the gas-geology principle in 88 mining area in the Luling coal mine of Suzhou in Anhui, and establishes the kinematic model and the pressure gradient calculation model. The Luling coal mine is controlled by the Xusu arc structure and duplex thrust that make the stress more concentrated, the gas pressure and gas content bigger, and the outburst disaster risk more serious than other mines in the Sulin mine area. In sequence, the 8th coal seam is the thickest stable coal seam developed near the maximum flooding surface, so the trap effectiveness of its roof and floor is good and the coal gas is accumulated. Faults superposition regions are prone to coal and gas outburst. 88 mining area is divided into the east and west gas geological units which have a different gas pressure gradient, respectively. The gas pressure in the east gas geology unit of higher elevation is the bigger, because the coal roofs of the hanging wall were damaged during the stretch of F14 normal fault. The research achievement is not only of essential guiding significance to the safety production of 88 mining area, but also provides a reference for the study on the coal gas geology principle of other mines.Key words: Luling coal mine; gas-geology; fault; roof; coal and gas outburst中上扬子晚奥陶世赫南特期岩相古地理刘伟 许效松 余谦 闫剑飞 门玉澎 张海全(成都地质矿产研究所，成都 610082)摘要 晚奥陶世赫南特期发生了全球性的气候变冷事件。中上扬子地区典型沉积为观音桥组，富产全球广泛分布的赫南特动物群，对应冰盖扩张引起的全球海平面下降阶段。根据岩性、沉积构造、生物组合及其保存状态，赫南特阶划分出潮坪相及浅海陆棚相。潮坪相主要沉积观音桥组炭泥质灰岩、钙质泥岩，底栖生物繁盛。浅海陆棚相主要沉积五峰组上部Normalograptus extraordinarius带黑色富硅质页岩、含放射虫硅质岩，并缺失观音桥组。研究表明，赫南特期延续了凯迪期晚期半局限海沉积格局。区域上，上扬子北部中扬子大部地区、上扬子西部洪雅康定等地继承了凯迪期晚期基座的浅海陆棚环境，仅有黄陵背斜神农架、重庆城口、鄂东南宋溪等地随着海平面下降沉积了观音桥组壳相灰岩。川中古隆起黔中古隆起康滇古陆间的潮坪沉积区，观音桥组内碎屑浅滩沉积主要分布于黔中古隆起北侧边缘，而局部相对低洼的地带则缺失了观音桥组。赫南特末期海平面下降至最低位，推测湖北五峰、汉南古陆边缘、黄陵背斜神农架、赣西北修水地区存在小范围的暴露区或剥蚀区。关键词 赫南特期；古地理；观音桥组；晚奥陶世；中上扬子Lithofacies palaeogeography of the Late Ordovician Hirnantian in the middle-upper Yangtze region of ChinaLIU Wei, XU Xiao-song, YU Qian, YAN Jian-fei, MEN Yu-peng, ZHANG Hai-quanChengdu Institute of Geology and Mineral Resources, Chengdu 610082, ChinaAbstract: The beginning of Hirnantian in Late Ordovician was followed by a global episode of Gondwana glaciation. Typical deposits were Guanyinqiao Formation deposits in the middle-upper Yangtze region of China during the period of the global sea-level fall caused by the ice-sheet growth. There, the worldwide spread Hirnantia-Dalmanitina fauna was abundant. According to lithologic characters, sedimentary structures, and biological assemblages and their preserved states, Hirnantian can be mainly classified as tidal flat facies and neritic shelf facies. There are several subfacies and microfacies in this study area. In the tidal flat facies, the Guanyinqiao Formation is mainly composed of carbon-argillaceous limestone and calcareous mudstone, including benthos of brachiopodas and trilobites of Hirnantia-Dalmanitina fauna. In the neritic shelf facies, however, the Hirnantian stage is composed of black siliceous shale and radiolarian chert in Normalograptus extraordinarius zone in the upper part of the Wufeng Formation and the Guanyinqiao Formation is absent. The results show that the Hirnantian, in succession of the paleogeographic framework in the late Katian stage, also has the characteristics of the semi-restricted shallow sea. Regionally, it succeeds the environment of the neritic shelf facies in the late Katian stage in the north of the upper Yangtze and the most part of the middle Yangtze region, as well as the tidal flat facies among the middle Sichuan uplift, middle Guizhou uplift and Kangdian old land. In the neritic shelf facies, the Guanyinqiao Formation shelly facies limestone deposited only in the Huangling anticline-Shenlongjia in the middle Hubei, Chengkou in Chongqing and Songxi in the southeast of Hubei as sea level was falling. In the tidal flat facies, the intraclast beach deposits distributed mainly over the north margin of the middle Guizhou uplift, but those deposits were absent in some lower areas. Within the process of sea-level falling to the lowest, in the Wufeng of Hubei, the marginal areas of the Hannan old land, the Huangling anticline-Shenlongjia in the middle Hubei and Xiushui in the northwestern Jiangxi, it is speculated that exposed or eroded areas existed in short time.Key words: Hirnantian; paleogeography; Guanyinqiao Formation; Late Ordovician; middle-upper Yangtze region西藏甲玛铜多金属矿床岩浆-热液过渡阶段的矿物学证据彭惠娟1汪雄武2侯林3周云2秦志鹏2 (1.中国地质科学院 矿产资源研究所, 北京 100037; 2.成都理工大学 地球科学学院,成都 610059; 3.中国地质大学 地球科学与资源学院，北京 100037)摘要 从矿物学的角度寻找甲玛铜多金属矿床斑岩体岩浆热液出溶的证据，建立起岩浆-热液过渡的详细过程。通过电镜扫面阴极发光对矿物的显微结构进行细致观察，并结合矿物化学特征，得到岩浆-热液过渡阶段的信息：(1)石英斑晶具有强烈的溶蚀结构，蠕虫状石英斑晶中溶蚀湾切断石英第一阶段的生长环带；(2)显微空腔将豆荚状或糖状结构石英与破布状黑云母（较少磷灰石、磁铁矿）、长石等相连接； (3)斑岩中伴生萤石，黑云母和角闪石中的F含量高;(4)斑岩体中流体包裹体与富挥发分熔融包裹体共存。岩浆挥发分作为主要的流体相被挤出岩浆并以气泡的形式聚集在岩浆房外壳顶部，并使已固结的矿物发生自交代。随着易挥发组分的增多，使气体压力大于束缚压力，导致岩浆外壳和邻近围岩突然破裂。岩浆流体沿着围岩裂隙流出并以热液的形式交代围岩。同时，由于减压造成岩浆热液的二次沸腾，使成矿元素沉淀。关键词 岩浆-热液过渡；石英斑晶；富F矿物；甲玛Magmatic-hydrothermal transitions evidence from mineralogy of Jiama Cu-polymetallic deposit in Tibet, ChinaPENG Hui-juan1, WANG Xiong-wu2, HOU Lin3, QIN Zhi-peng2, ZHOU Yun21.Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;2.College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China; 3.Facutly of Geoscience and Resources, China University of Geosciences, Beijing 100037, ChinaAbstract: The information about the magmatic to hydrothermal transition is preserved in the porphyry of the Jiama Cu-polymetallic ore deposit in Tibet. It includes the quartz phenocrysts with strong resorption textures such as vermicular zones of igneous groundmass cutting primary quartz cathodoluminescence banding, the pods of saccharoidal quartz connected by graphic quartz-alkali feldspar intergrowths and ragged biotite, the fluorite as an accessory mineral in igneous rocks, high F in hydroxyl sites in igneous biotite and amphibole, and the fluid inclusions and silicate melt inclusions presenting in the porphyry of the Jiama deposit. The authors present detailed petrographic observations of primary igneous features, combined with silicate-melt and fluid inclusion studies, and find physical models of exsolution. Metallic elements are preferentially partitioned into the associated magmatic volatile phase. As the volatile concentration increases, the vapor pressure leads to sudden failure of the carapace and adjacent wall rock - this occurs once the vapor pressure is greater than the confining pressure. Magmatic fluids escape as the cracking of the wall rock continues; these fluids then hydrothermally alter the rock which they pass through. At the same time, caused by the rapid decreasing pressure, the hypersaline fluid boils again. This causes Cu-Mo sulfides to deposit from the fluid.Key words: magmatic-hydrothermal transition; quartz phenocryst; mineral with high F; Jiama利用接收函数反演龙门山断裂带及邻区深部结构王成1朱介寿1宋文杰2江晓涛1(1.油气藏地质及开发工程国家重点实验室(成都理工大学)，成都 610059；2.中国石油 塔里木油田勘探开发研究院，新疆 库尔勒 841000)摘要 利用接收函数的方法通过接收震中距30°90°、震级在5.5以上的远震事件反演龙门山断裂带及其邻区的深部结构，探索汶川地震形成原因。结果表明，扬子地台西缘的莫霍面向西侧倾斜缓降；处在龙门山推覆体范围之内的都江堰、汶川一带莫霍面起伏变化不大，在跨过龙门山中央断裂带后开始下降，向北降至黑水县附近后平缓上升。结合2005年10月至2007年4月远震P波波形资料接收函数反演结果：2条被动源剖面均显示莫霍面在龙门山推覆体中央位置深度约43 km的地方出现不同程度的陡降，说明该断裂带是地壳厚度的陡变带，为扬子地台和松潘甘孜地台的构造边界。莫霍面深度向南陡降至最深约68 km处后平缓上升，向北陡降至最深约58 km处后平缓上升。表明松潘-甘孜地块东缘地壳厚度呈南深北浅、东深西浅分布。关键词 被动源;龙门山断裂带;接收函数法;深部结构Received function experiment for the Longmenshan fault zone and the deep structure of adjacent areasWANG Cheng1, ZHU Jie-shou1, SONG Wen-jie2, JIANG Xiao-tao11.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitati