下扬子区二叠系层序地层的地球化学特征

本文以安徽巢县平顶山、鬼门关剖面为例，阐述了二叠系沉岩的主要岩石类型，即灰岩、硅质岩和泥质岩的岩石学特征及稀土元素组成特点；划分出七种沉积相类型，即局限台地相、开阔台地相、斜坡相、盆地相、三角洲相、汪 相和陆缘泻湖相；识别出七个Ⅲ级层序，其中四个为Ⅰ型层，三个为Ⅱ型层序。对栖霞组灰岩的地球化学测试数据进行了统计分析，总结了海侵体系域，高水位体系域的氧碳同位素、稀土元素和微量元素组成的差异，并认为造     

江西省核工业地质局机关 保持共产党员先进性教育活动工作总结（摘要）

按照中央和省委的部署，我们这次开展的先进性教育活动，共分为三个阶段进行：一是学习动员阶段；二是分析评议阶段；三是整改提高阶段。四个多月来，我们结合实际，以”七个抓，七个坚持，七个突出”为主要方式，认真组织实施，严格按步骤操作，教育活动进展顺利，富有成效。     

聚焦中国勘察设计协会七届二次理事会议暨七届二次常务理事会议

<正>12月27日，中国勘察设计协会七届二次理事会议暨七届二次常务理事会议以线上方式召开。中设协理事长朱长喜出席会议并作协会2022年工作总结报告；副理事长王子牛主持会议并作审议表决事项的说明。第七届理事会负责人及常务理事、理事共531人出席会议。朱长喜作中国勘察设计协会2022年工作总结报告。他从加强调查研究，当好政府的参谋和助手；加强业务创新引领，促进企业转型发展；加强诚信体系建设，     

以改革创新和开拓前进的精神努力搞好“七五”头一年的工作

全体探矿同行们：在明媚的春天，我们迎来了第七个五年计划的第一年——光辉的一九八六年。在第七个五年计划期间，我们将会面临着各种各样的新挑战。体制要改革，探矿工程将逐步从事业型转向经营型，要贯彻一业为主，多种经营的方针；要扩大探矿工程的服务领域，为“对内搞活、对外开放”服务；还要努力推广一大批“六五”期间的勘探技术科研成果等等。     

试论层序地层学在1∶5万区调工作中的应用—以浑江地区为例

通过在吉南浑江地区开展的白山市等三幅１∶５万区调工作，尝试性地运用层序地层学的理论，初步总结了不同特征的不整合面（层序界面）及凝缩段的识别标志；分析了地层序列中矿产分布特征；探讨了层序分析中以剖面岩石（岩性、组构）、相转换界面的基础研究方法。进而将浑江地区新元古代—早古生代地层划分为三个Ⅱ级沉积序列（超层序）、七个Ⅲ级沉积序列（层序）。     

四川省地质学会第八届理事扩大会暨学术报告会在成都召开

四川省地质学会第八届理事扩大会暨学术报告会于2006年12月22日在成都理工大学国际学术会议厅隆重召开。刘永湘副厅长受宋光齐厅长委托主持会议。学会第七届理事会副理事长成都理工大学校长刘家铎致开幕词；四川省科协黄竞跃副主席致贺词；省人大原副主任刘永顺宣读中国地质学会等单位致大会的贺词；傅应铨理事长作七届理事会工作报告；表彰学会工作先进集体、先进个人和优秀论文作者并颁奖；选举第八届理事会理事长、副理事长、常务理事和秘书长；通过授予第八届理事会名誉理事长和名誉理事；秦钢秘书长通报了四川省地质学会章程修改意见和团体会费标准调整方案。[第一段]     

2001年山东省地质调查工作进展和主要成果

2001年山东省地质调查工作取得了重大进展－查明了苏鲁造山带（东段）的北西边界为牟（平）－即（墨）断裂带，在其东侧牟平区通海－王格庄一带发现榴辉岩；在青海省囊谦县寺红乡四荣赛发现层状铜矿；胶南七宝山发现铅、银多金属矿和萤石矿；平邑铜石地区发现3处金矿产地。     

扬子地台西缘北段震旦系露头层序地层学研究

运用露头层序地层学的方法，对四川汶川县七盘沟、广元市羊木东溪河震旦系剖面进行了详细的研究；将该区上震旦统地层划分为1个Ⅱ级层序，4个Ⅲ级层序和3个等时界面；建立了该区上震旦统等时地层格架，编制了相对海平面变化曲线。     

淮北刘桥二矿七含涌(突)水机理研究

刘桥二矿在开采4煤过程中，七含突水次数达38次之多，严重影响煤矿安全生产。文章在系统地分析刘桥二矿七含涌突水概况的基础上，提出了该矿七含涌突水的主要机理为断裂构造的控制作用和矿山压力的促进作用；指出了砂岩含水层的裂隙发育程度和富水性强弱、煤层的厚度、断层的作用以及4煤与含水层之间隔水层厚度的大小等，是影响工作面涌水的主要因素。研究结果对煤矿砂岩水害的有效防治具有重要的指导意义。     

山东省石炭—二叠—三叠纪岩石地层清理意见

重新厘定的山东省石炭－二叠－三叠纪岩石地层分为二个群、七个组、五个正式段。下部的含煤岩系为月门沟群，时代为晚石炭世－早二叠世，包括本溪组、太原组和山西组，本溪组底部的铁铝岩系为湖田段；中部一套杂色地层，以黄绿、灰绿、紫色砂、页岩为主，基本不含煤层，为石盒子组，时代为早二叠世－晚二叠世，分为黑山段、万山段、奎山段和孝妇河段；上部一套基本不含植物化石的红色地层，主要以砂岩为主，夹泥岩，为石千峰群，分为孙家沟组和刘家沟组，时代为三叠纪。     

Origins of authigenic minerals and their impacts on reservoir quality of tight sandstones: Upper Triassic Chang-7 Member,Yanchang Formation,Ordos Basin,China

Reservoir quality is critical for sweet-spot evaluation in tight sandstone plays, but few studies have focused on the origin of authigenic minerals in tight sandstones and their impact on reservoir quality. This study integrates petrographic analysis, carbon and oxygen isotopic data and mercury injection capillary pressure data of the Upper Triassic Chang-7 tight sand reservoir samples in the Ordos Basin, China to understand the origin of authigenic minerals and the impact of authigenic minerals on reservoir quality. Carbonate minerals, including calcite, ferroan calcite and dolomite, and kaolinite, are the major authigenic minerals in the Chang-7 sandstone. They were derived from the chemical diagenetic alteration of detrital feldspar and biotite, with the involvement of ions that are believed to be primarily from the connate water in interstitial pore space of the interbedded mudstones. Meteoric water and organic fluids from hydrocarbon generation may also have been involved in the alteration processes of the minerals in the Chang-7 tight sandstone. The origin of kaolinite indicates that the porosity was increased by dissolution of detrital grains, offsetting the porosity loss from burial compaction. Authigenic minerals appear to have a weak correlation with pore structure, suggesting that the pore structure of the Chang-7 tight sandstone is not only controlled by major authigenic minerals but also affected by other geological factors.     

鄂尔多斯盆地宁县-合水地区长6、长7、长8储层裂缝差异性及开发意义

根据露头、岩心及测井等资料,对比研究了宁县—合水地区长6、长7、长8储层裂缝发育特征的差异性,并讨论其开发意义。宁县—合水地区长6、长7、长8储层均发育构造裂缝和成岩裂缝两种成因类型,但各储层的裂缝产状、裂缝规模(纵向高度及平面长度)及裂缝发育程度存在较大差别。长6储层主要发育近东西向和近南北向两组裂缝,长7储层北东东—南西西向裂缝最为发育,其次为近东西向和近南北向,长8储层北东东—南西西向裂缝最为发育,其次为近东西向裂缝和北西西—南东东向;各储层均以发育高角度构造裂缝为主,但长6储层还发育一定数量中低角度泥岩滑脱裂缝,比例相对较大;在裂缝规模和裂缝发育程度上,长7储层裂缝最为发育,规模相对较小,长8储层裂缝发育程度最差,但具有较大的裂缝规模,长6储层裂缝发育程度和规模介于以上两者之间。由于长6、长7、长8储层裂缝发育特征的差异性,在现今地应力场作用下不同层位、不同产状裂缝开启能力会存在差异,因此在进行注水开发时,要根据各储层裂缝的发育情况,准确计算不同层位裂缝开启压力值,进而确定合理的注水参数,避免注水压力过大造成裂缝大规模开启。此外,通过计算长6、长7、长8储层脆性指数可知,长7储层脆性相对较大,且天然裂缝最为发育,适合采取体积压裂进行储层改造。     

铁边城北地区长7油层组储层特征研究

通过铸体薄片分析、扫描电镜、岩芯粒度分析等技术和手段,应用储层沉积学、沉积岩石学、石油地质学等基本理论,对铁边城北地区长7油层组储层的岩石学特征、物性发育特征进行认真分析,认为铁边城北长7油层组砂岩储层主要发育岩屑质长石细砂岩,分选较好,磨圆度中等,结构成熟度中等,粒内孔隙为主,属于低孔特低渗储层,认为影响长7储层的主要控制因素是沉积作用与储层后期成岩作用。     

Petrology, geochemistry and remote sensing data of island arc assemblage along Wadi Abu Marawat, Central Eastern Desert, Egypt

The basement rocks of Abu Marawat area comprise serpentinites (oldest), metavolcanics and their equivalent pyroclastics, intrusive metagabbro–diorite complex, synkinematic granitoids, Hammamat sediments and basic intrusion (youngest). Remote sensing ETM+ data of Abu Marawat area were analyzed, and band ratios technique was applied to discriminate between different varieties of these basement rocks. Serpentinites are represented by lensoidal bodies tectonically incorporated in the metavolcanics. On band ratio 5/7 image, they are characterized by very bright image signature. The metavolcanics comprise basalts, andesite and subordinate dacites together with their equivalent pyroclastics. They were regionally metamorphosed up to the greenschist facies and exhibit dark grey image signatures on band ratio 5/7 image. The metagabbro–diorite complex is made up of metagabbros, diorites and quartz diorites, whereas the synkinematic granitoids are formed of tonalites and granodiorites. The band ratio 5/7 image illustrates tonalites with dark image signature, whereas metagabbro–diorites and granodiorites exhibit grey image signature. The metavolcanic suites are of island arc setting, where metabasalts are of tholeiitic affinity, while the meta-andesites and metadacites are of calc-alkaline character. The metagabbroic and granitoid rocks are of I-type, calc-alkaline affinity and were formed in arc tectonic setting. They are enriched in LIL elements and depleted in Nb and HFS elements, a characteristic feature of subduction-related magmatism. The regular variation trends among the major and trace elements as well as the coincidence of the plotted samples favor the assumption that they are comagmatic and formed by processes such as fractional crystallization.     

Late Miocene Magmatic-Hydrothermal Systems in the Jozankei-Zenibako District, Southwest Hokkaido, Japan

Abstract: Hydrothermal systems related to magmatic intrusions in the Jozankei-Zenibako district, southwest Hokkaido are examined, based on field observations, K-Ar ages, and alteration mineral assemblages. The study reveals five major magmat–ic–hydrothermal systems of Late Miocene in age, comprising Ogawa (9. 7 Ma), Jozankei (9. 5–9. 0 Ma), Otarunaigawa (8. 7 Ma), Asarigawa (8. 8 and 6. 7 Ma) and Hariusu (6. 7 Ma). The Ogawa system is related to granodiorite, and the Jozankei, Otarunaigawa and Asarigawa systems are related to quartz porphyry.
The Ogawa system includes potassic, sericitic, propylitic and advanced argillic alteration as well as base-metal mineralization, represented by the Toyotomi deposit. The Jozankei and Otarunaigawa systems lack significant potassic alteration, and are accompanied by sericitic and propylitic alteration. The Otarunaigawa system is associated with base-metal mineralization at Toyohiro and Inatoyo. The Asarigawa and Hariusu systems include advanced argillic and argillic alteration, as well as iron sulfide deposits. The presence of potassic alteration only in the Ogawa system is ascribed to deeper emplacement (˜3 km from the surface) of the intrusive magma. These systems formed in terrestrial environments that existed from ca. 11 Ma to 8. 5 Ma and after 7. 5 Ma in the district.
Age–data compilation shows that the major advanced argillic alteration events in southwest Hokkaido, including those in the Jozankei-Zenibako district, formed during the periods from 9. 7–6. 5 Ma and 3. 5–1. 5 Ma. These periods correspond to the timing of normal subduction of the Pacific plate beneath the Northeast Japan arc. Normal, in contrast to oblique, plate subduction is characterized by andesitic, polygenetic volcanism and associated advanced argillic alteration.     

Geochemistry of the Uintjiesberg kimberlite, South Africa: petrogenesis of an off-craton, group I, kimberlite

The Uintjiesberg kimberlite diatreme occurs within the Proterozoic Namaqua–Natal Belt, South Africa, approximately 60 km to the southwest of the Kaapvaal craton boundary. It is a group I, calcite kimberlite that has an emplacement age of 100 Ma. Major and trace element data, in combination with petrography, are used to evaluate its petrogenesis and the nature of its source region. Macrocryst phases are predominantly olivine with lesser phlogopite, with very rare garnet and Cr-rich clinopyroxene. Geochemical variation amongst the macrocrystic samples (Mg# 0.85–0.87, SiO₂=27.0–29.3%, MgO=26.1–30.5%, CaO=10.9–13.5%) is shown to result from 10% to 40% entrainment and partial assimilation of peridotite xenoliths, whereas that shown by the aphanitic samples (Mg# 0.80–0.83, SiO₂=19.1–23.0%, MgO=17.9–23.9%, CaO=16.5–23.7%) is consistent with 7–25% crystal fractionation of olivine and minor phlogopite. Changing trajectories on chemical variation diagrams allow postulation of a primary magma composition with 25% SiO₂, 26% MgO, 2.3% Al₂O₃, 5%H₂O, 8.6% CO₂ and Mg#=0.85.

Forward melting models, assuming 0.5% melting, indicate derivation of the primary Uintjiesberg kimberlite magma from a source enriched in light rare earth elements (LREE) by 10× chondrite and heavy REE (HREE) by 0.8–2× chondrite, the latter being dependent on the proportion of residual garnet. Significant negative Rb, K, Sr, Hf and Ti anomalies present in the inferred primary magma composition are superimposed on otherwise generally smooth primitive mantle-normalized trace element patterns, and are inferred to be a characteristic of the primary magma composition. The further requirement for a source with chondritic or lower HREE abundances, residual olivine with high Fo content (Fo₉₄) suggests derivation from a mantle previously depleted in mafic melt but subsequently enriched in highly incompatible elements prior to kimberlite genesis. These requirements are interpreted in the context of melting of continental lithospheric mantle previously enriched by metasomatic fluids derived from a sublithospheric (plume?) source.     

Depositional setting and geometric structure of the Beypazari lignite deposits, Central Anatolia, Turkey

The Neogene Beypazari basin is one of the important coal districts of Central Anatolia with approximately 600 million short tons lignite reserves. The coal-bearing Neogene sediments occurring in the Beypazari basin are divided into seven formations, in ascending order; Çoraklar, Hirka, Akpinar, Çayirhan, Bozbelen and Kirmir Formations with Sariyar Limestone and Teke volcanics.The Çoraklar Formation consists of cross-bedded sandstones, channel-fill conglomerates, mudstones, carbonaceous shales and volcanoclastic pebblestones, which are fluvial in origin. The lower lignite seam occurs in the lower part of the Çoraklar Formation.The upper lignite seam occurs in the uppermost part of the Çoraklar Formation and is overlain by the Hirka Formation with a sharp contact. The Hirka Formation consists mainly of alternating shale, mudstone, bituminous shale, claystone, tuffite and silicified limestone, and they all are apparently of lacustrine origin.The lignite deposite occur in the Çayirhan and Koyunaǧili parts of the Beypazari Neogene basin. The Çayirhan coal field consists of lower and upper lignite seams, but the Koyunaǧili field contains only an upper lignite seam.The lower lignite seam, which does not crop out at the surface, indicates a fluvial origin of the lignite deposits, based on the lateral discontinuity and the lower sulphur content of the lower lignite seam, and the sedimentologic and stratigraphic features of the associated sediments. But the uniform stratigraphic and sedimentologic features, high sulphur content and wide-spread distribution of the upper lignite seam indicate that the upper lignites were deposited probably in a mud-flat facies of playa-lake environment. The lower and upper lignites are completely different in relation to the depositional environment, the geometry and degree of rank in lateral directions.The lateral spreading and geometry of the lower lignite deposits were controlled by channel, floodplain and well-drained marshes of a fluvial system. On the basis of recent drillings and field investigations, the lower lignite deposit has been demonstrated to be a linear spreading parallel to the axis of the channel fills and throughcross beds in clastic sediments of fluvial facies. Therefore, the lower lignite deposits trend along a northeastern direction and is not expected to be as widely spread as the upper lignites.     

Late-Cenozoic pull-apart basins, Boconó fault zone, Venezuelan Andes

Several areas along the Boconó fault zone are characterized by elongate, almond-shaped basins containing thick alluvial sequences, mainly of Quaternary age, and bounded by faults with normal Quaternary displacements. These areas are separated by segments characterized by narrow fault traces and right-lateral displacements. The fault-bounded basins are interpreted as pull-apart basins that originated at releasing bends along the fault zone. The size of the La González pull-apart basin suggests that Pliocene (?)-Quaternary right-lateral slip on the Boconó fault zone was of the order of 7–9 km.     

河北三家金矿区构造研究及找矿方向

文章论述了青龙县三家金矿区构造特征、矿床特征、矿床与断裂构造的成因联系。在多种手段综合研究的基础上,指出了矿区导矿构造和容矿构造,提出了本区中生代的三期主要构造应力场,强调了矿区内局部应力场与相应方向的优势节理相配合是本区金矿床形成的主要模式。在综合分析各项研究成果的基础上提出了本区控矿因素及找矿方向。     

Facies analysis and depositional environments of the OligoceneeMiocene Asmari Formation,Zagros Basin,Iran

The Asmari Formation(a giant hydrocarbon reservoir)is a thick carbonate sequence of the Oligocenee Miocene in the Zagros Basin,southwest of Iran.This formation is exposed at Tang-e-Lendeh in the Fars interior zone with a thickness of 190 m comprising medium and thick to massive bedded carbonates.The age of the Asmari Formation in the study area is the late Oligocene(Chattian)eearly Miocene(Burdigalian).Ten microfacies are defned,characterizing a gradual shallowing upward trend;the related environments are as follows:open marine(MF 8e10),restricted lagoon(MF 6e7),shoal(MF 3e5),lagoon(MF 2),and tidal fat(MF 1).Based on the environmental interpretations,a homoclinal ramp consisting of inner and middle parts prevails.MF 3e7 are characterized by the occurrence of large and small porcelaneous benthic foraminifera representing a shallow-water setting of an inner ramp,infuenced by wave and tidal processes.MF 8e10,with large particles of coral and algae,represent a deeper fair weather wave base of a middle ramp setting.