西藏谢通门县央弄地区铜找矿前景

本文在区域地质、水系沉积物测量、土壤测量和高精度磁测等方面对央弄地区的铜找矿前景进行了初步分析。利用1∶5万水系沉积物测量编制异常图,发现区内Mo、W、Sb、Cu、Au、Hg、Bi、Sn、Ag、Pb、Ba、As等元素有不同规模的明显异常,且Mo、W、Sb、Cu异常规模较大;通过土壤剖面可以看出Cu异常更显著。通过高精度磁测结果显示,化探异常位于磁异常附近;且已知铜矿化点位于磁异常附近。通过土壤测量数据研究元素间组合关系,推断区内可能的矿床类型为侵入岩型铜多金属矿,并对区内已发现的铜矿化点着重介绍。研究表明区内寻找侵入岩型铜多金属矿有较好的找矿前景。     

谢通门色药异常区铜找矿前景浅析

本文在区域地质、水系沉积物测量、土壤测量和高精度磁测等方面对色药异常区的铜找矿前景进行初步分析。利用1∶5万水系沉积物测量编制异常图,发现区内Mo、Cu、Bi、Pb、Zn、Sb、Sn、W、Ag、Hg等元素均有不同规模的异常,且Mo、Cu异常规模较大。通过高精度磁测结果显示区内有3个磁异常,已知铜矿化点均位于磁异常附近。通过土壤测量数据研究元素间的组合关系,推断区内可能的矿床类型与酸性侵入岩有关的斑岩型铜多金属矿。并对区内已发现的1号铜矿化点进行重点研究,表明区内寻找与中酸性侵入岩有关的铜多金属矿具有良好的找矿前景。     

西藏谢通门县普迟亚地区高精度磁测成果及找矿方向

通过1:5万地面高精度磁测的实地调查,对工作区的磁场特征有了详细的了解.经磁异常的定性分析,筛选出11个找矿潜力较大的异常区.同时1:5万水系沉积物测量成果表明区内主要找矿元素为Cu、Pb、Zn.磁异常的定性分析对这些金属矿的深部找矿预测可以提供有利证据.结合化探异常、地质特征、矿化特征优选出了展咱木部-坑马勒间强磁异...     

勘查地球化学在西藏色岗地区铅锌找矿中的应用

在西藏色岗扎西康铅锌整装勘查区内开展地球化学勘查。利用1∶5万水系沉积物测量编制异常图,发现区内Ag、Pb、Zn、Sb、Au、As、Bi、Mn等元素有不同规模的明显异常,且Ag、Pb、Sb、Au异常规模较大。通过土壤测量可以看出Ag、Pb、Zn、Sb、Au、As异常更显著。通过高精度遥感结果显示,化探异常位于线性构造附近;且已知矿化点位于断裂附近。通过土壤测量数据研究元素间组合关系,推断区内可能的矿床类型为为受构造控制的热液脉型铅锌矿,并对区内已发现的铅锌矿化点做着重介绍。研究表明区内寻找受构造控制的热液脉型铅锌矿有较好的找矿前景。     

勘查地球化学在西藏色岗地区铅锌找矿中的应用

在西藏色岗扎西康铅锌整装勘查区内开展地球化学勘查。利用1∶5万水系沉积物测量编制异常图,发现区内Ag、Pb、Zn、Sb、Au、As、Bi、Mn等元素有不同规模的明显异常,且Ag、Pb、Sb、Au异常规模较大。通过土壤测量可以看出Ag、Pb、Zn、Sb、Au、As异常更显著。通过高精度遥感结果显示,化探异常位于线性构造附近;且已知矿化点位于断裂附近。通过土壤测量数据研究元素间组合关系,推断区内可能的矿床类型为为受构造控制的热液脉型铅锌矿,并对区内已发现的铅锌矿化点做着重介绍。研究表明区内寻找受构造控制的热液脉型铅锌矿有较好的找矿前景。     

青海省尕河地区水系沉积物测量异常特征及优选找矿靶区

通过对尕河地区1∶2.5万水系沉积物资料处理,圈定了Cu、Pb、Zn、Ag、Au、As、Sb、Cr、Ni、Co等异常,揭示了区内异常的分布特征,评价异常的找矿意义,划分了元素组合,结合地质成矿背景,依据化探综合异常及中低温热液型元素组合特征,确定Pb、Ni、Ti的4个找矿远景区,其中优选出3号铅找矿靶区,4号钛、镍重点找矿靶区。     

河北XD银矿外围水系沉积物地球化学异常特征和找矿方向浅析

对XD银矿床外围水系沉积物地球化学异常特征研究表明,区内具有极好的寻找银（金）多金属矿前景,认为Ag,Pb是近程指标元素,Zn,As,Sb为远程指标元素,拆离断层及隐伏拆离断层上盘,次火山岩与长城系碎屑岩接触带的Ag多金属异常分布区是今后找矿的重要靶区。     

云南镇康地区区域地球化学特征及找矿方向

基于1∶5万水系沉积物测量成果,对云南镇康地区的地球化学参数进行计算和分析,并对分布特征、岩石地球化学特征、异常元素组合特征进行研究。结果表明,二叠系沙子坡组(Ps^)中的Cu、Ni、Hg、Mo、Zn、As含量高出全国水系沉积物均值的2~4倍,是该区最具找矿潜力的地球化学地层。以Zn、Pb、Cu为主的异常元素组合主要分布在芦子园复式背斜轴部附近;而以Hg、Sb、Pb为主的异常元素组合主要分布在麻栗林断裂以东的大东子—南伞隆起部位,异常呈北东或北北东向展布,与主要构造线方向一致。研究区元素异常分带与区内已知矿产一致,具有由南往北,由Cu、Pb、Zn、Ag、Mo、W、Ni等逐渐向Pb、Zn、Ag、As、Au、Sb、Hg→Sb、Hg的元素温度分带特征,应按此元素分带规律寻找相应矿产。结合地质、矿产分布特征,圈定了找矿靶区9个,为该区寻找多金属矿提供地球化学依据。     

奔都-汤满地区水系沉积物地球化学特征及找矿

对奔都-汤满地区16个元素水系沉积物测量地球化学特征研究,贫乏元素有Sn、Bi、Mo、W;正常元素有Pb、Ag、Hg、Au;富集元素有Zn、Cr、Sb、As;强富集的元素有Cu、Ni、Co、Cd。通过各元素时空分布研究,对主要地球化学异常进行推断解释,指出区内蛇绿混杂岩带、冈达概组二段是寻找Cu、Pb、Zn、Au、Ag等多金属矿的有利层位。     

新疆库马苏-小土尔根一带化探异常特征及找矿前景

诺尔特地区下石炭统红山嘴组火山岩为Pb、Zn、Ag、Au矿源层,燕山期岩浆活动对矿源层中的成矿元素进一步富集,并在构造有利部位成矿。该区1∶20万、1∶5万水系沉积物测量和l∶2.5万土壤化探测量资料显示,区内下石炭统中-酸性火山岩出露区以P b、Zn、Ag、Au元素组合为特色的化探综合异常带具有规模大,强度高,浓集中心明显的特点,在异常周边已先后发现了多个铅锌、金、多金属矿床、矿点和矿化点,显示了库马苏-小土尔根地区具有非常好的找矿前景。     

普迟亚地区水系沉积物测量地球化学特征及找矿方向

在1∶5万水系沉积物测量的基础上,对西藏谢通门普迟亚地区的地球化学特征进行了初步分析.对元素分布特征、单元素异常特征、元素相关性分析、异常元素组合特征进行了研究.研究发现Pb、Zn 、Cu为区内具一定潜力的找矿指标.推断区内可能的成矿类型为火山岩型铅锌多金属矿和与酸性侵入岩有关的斑岩型铜多金属矿,优选了展咱木部铅锌找矿远景区和色药铜(钼)找矿远景区.     

内蒙古阿拉善地区的第三系及其动物群

笔者依据丰富翔实的资料,论述了该区第三地层的分布,区划,地层划分沿革,岩性,岩相古地理特征及地质演化史;在地层方面,首次在内蒙古西部建立了比较完整的第三纪地层序列;命名和划分了中始新统乌兰乌珠尔组,上始新统查干布拉格组。下渐新统乌兰塔塔尔组,上渐新统,下中新统乌尔较组,上中新统呼和好来组和上新统昂冈浩特组等６个地层单元,补充界定了查干布拉格组并将其时代厘定为晚始新世;在动物群方面,发现和命名了中始     

Characteristics and evolution of the Tertiary palaeovalleys in the northwest Gawler Craton,South Australia

Integrated geoscientific datasets have contributed to an understanding of the Tertiary palaeovalleys once draining the Gawler Craton. Systematic investigations of both the shape and depth of the channels are based on interpretations from field exposures, a compendium of geological and drilling data, computer modelling of ancient landscapes, topographic and evaluated digital elevation models, remote sensing imagery, magnetics, seismic, gravity, airborne and transient electromagnetics, and radiometrics. Physical property contrasts that exist between the channel sediments and the underlying bedrock, for example, can be differentiated by geophysical methods to locate the incised‐valley thalweg. Evidence from sedimentology is combined with evidence from other geological and geophysical characteristics to arrive at a general reconstruction of palaeovalley architecture and history. The palaeovalleys were originally incised into the weathered pre‐Tertiary landscape of mostly weathered basement, and Tertiary fluvial, lacustrine, estuarine and even marine sediments accumulated during the Eocene and Miocene. Marine influence extended at least 100 km up the palaeovalleys during at least three major transgressions in the Eocene and Miocene intervals. Major sedimentary phases occurred in the Paleocene to Early Eocene, Middle to Late Eocene, Oligocene to Early Miocene, and Middle Miocene to Early Pliocene times.     

The Ust-Davydovka Formation: A paleogene reference stratigraphic unit of the Primorye region, Russian Far East

The nomenclature history of the Ust-Davydovka Formation (Lower-Middle Miocene, according to its formal status) is considered with characteristics of the geological data on its stratotype in the Rechnoi Peninsula (Vladivostok area) as well as on its position and role in the regional stratigraphic scheme. The Ust-Davydovka formation was dated as Late Eocene based on the fossil micro-and macroflora. A new correlation variant proposed for Tertiary sections in different segments of the Artem-Tavrichanka Depression (type region of the Ust-Davydovka Formation) eliminates contradictions between floral and faunal data.     

Tertiary facies architecture in the Kutai Basin,Kalimantan, Indonesia

The Kutai Basin occupies an area of extensive accommodation generated by Tertiary extension of an economic basement of mixed continental/oceanic affinity. The underlying crust to the basin is proposed here to be Jurassic and Cretaceous in age and is composed of ophiolitic units overlain by a younger Cretaceous turbidite fan, sourced from Indochina. A near complete Tertiary sedimentary section from Eocene to Recent is present within the Kutai Basin; much of it is exposed at the surface as a result of the Miocene and younger tectonic processes. Integration of geological and geophysical surface and subsurface data-sets has resulted in re-interpretation of the original facies distributions, relationships and arrangement of Tertiary sediments in the Kutai Basin. Although much lithostratigraphic terminology exists for the area, existing formation names can be reconciled with a simple model explaining the progressive tectonic evolution of the basin and illustrating the resulting depositional environments and their arrangements within the basin. The basin was initiated in the Middle Eocene in conjunction with rifting and likely sea floor spreading in the Makassar Straits. This produced a series of discrete fault-bounded depocentres in some parts of the basin, followed by sag phase sedimentation in response to thermal relaxation. Discrete Eocene depocentres have highly variable sedimentary fills depending upon position with respect to sediment source and palaeo water depths and geometries of the half-graben. This contrasts strongly with the more regionally uniform sedimentary styles that followed in the latter part of the Eocene and the Oligocene. Tectonic uplift documented along the southern and northern basin margins and related subsidence of the Lower Kutai Basin occurred during the Late Oligocene. This subsidence is associated with significant volumes of high-level andesitic–dacitic intrusive and associated volcanic rocks. Volcanism and uplift of the basin margins resulted in the supply of considerable volumes of material eastwards. During the Miocene, basin fill continued, with an overall regressive style of sedimentation, interrupted by periods of tectonic inversion throughout the Miocene to Pliocene.     

Geometry and kinematics of the Mosha Fault, south central Alborz Range, Iran: An example of basement involved thrusting

Field investigation of the western part of the Mosha Fault in several structural sections in the south central Alborz Range showed that the fault has a high angle of dip to the north, and emplaces Precambrian to Cenozoic rocks over the Eocene Karaj Formation. Study of the kinematics of the Mosha Fault in this area, based on S–C fabric and microstructures, demonstrates that it is a deep-seated semi-ductile thrust. Strain analysis on rock samples from different sections across the Mosha Fault shows a flattening pattern of deformation in which the long axis of the strain ellipsoid is aligned in the fault shear sense. The Mosha Fault is associated with a large hanging-wall anticline, cored by Precambrian rocks, and series of footwall synclines, formed of late Tertiary rocks. This geometry, together with several low angle short-cut thrusts in the fault footwall, implies that the Mosha Fault is an inverted normal fault which has been reactivated since the late Tertiary. In the study area, the reverse fault mechanism was associated with the rapid uplift and igneous activity in the central Alborz Range during the late Tertiary, unlike in the eastern portion of the fault, where the fault kinematics was replaced by a strike-slip mechanism in the Late Miocene.     

青海某地第三系红色碎屑岩层中金异常特征及成因探讨

对青海某地第三系红色碎屑岩层中的金异常特征进行了综述,指出金异常主要存在于第三系中段岩层中,异常在水系沉积物中强度最大,并认为金异常由次生富集作用形成。     

Tertiary stratigraphy of Western Australia

This paper is a summary of the present knowledge of the Tertiary stratigraphy of Western Australia. Also included is new information on the Cainozoic of the Carnarvon Basin, a result of petroleum exploration in the area.

Tertiary rocks formed during more than one cycle of deposition in three basins (Eucla, Perth, and Carnarvon), and also as thin units deposited in a single transgression along the south coast. The Tertiary stratigraphy of the Bonaparte Gulf Basin is not well known.

Drilling in the Eucla Basin has encountered up to 400 m of Tertiary in the south central part, with uniform thinning towards the margins. The section begins with a middle‐upper Eocene carbonate unit which represents the dominant event in the Tertiary sedimentation in this basin. More carbonates were deposited in the late Oligocene‐early Miocene and middle Miocene.

Along the south coast, the so‐called Bremer Basin, the Plantagenet Group (up to 100 m) of siltstone, sandstone, spongolite, and minor limestone, was deposited during the late Eocene.

The Perth Basin contains up to 700 m of Tertiary sediment, formed during at least two phases of sedimentation. The upper Paleocene‐lower Eocene Kings Park Formation consists of marine shale, sandstone, and minor limestone, with a thickness of up to 450 m. The Stark Bay Formation (200 m) includes limestone, dolomite, and chert formed during the early and middle Miocene. Events after deposition of the Stark Bay Formation are not well known.

The northern Carnarvon Basin and Northwest Shelf contain by far the most voluminous Tertiary sediment known from Western Australia: 3500 m is known from BOCAL's Scott Reef No. 1. A more usual maximum thickness is 2500 m. Most sediments were laid down in four episodes, separated by unconformities: late Paleocene‐early Eocene; middle‐late Eocene; late Oligocene‐middle Miocene; and late Miocene to Recent.

The Paleocene‐early Eocene cycle consists of about 100–200 m (up to 450 m in the north) of carbonate, shale, and marl of the Cardabia Group containing rich faunas of planktonic foraminifera.

The middle‐late Eocene sediments include diverse rock types. Marine and nonmarine sandstone formed in the Merlinleigh Trough. At the same time, the Giralia Calcarenite (fauna dominated by the large foraminifer Discocyclina) and unnamed, deeper water shale, marl, and carbonate (with rich planktonic foraminiferal faunas) formed in the ocean outside the embayment. Thickness is usually of the order of 100–200 m.

The main cycle of sedimentation is the late Oligocene‐middle Miocene, during which time the Cape Range Group of carbonates formed. This contains dominantly large foraminiferal faunas, of a wide variety of shallow‐water microfacies, but recent oil exploration farther offshore has recovered outer continental shelf facies with abundant planktonic foraminifera. A minor disconformity representing N7 and perhaps parts of N6 and N8 is now thought to be widespread within the Cape Range Group. The last part of this cycle resulted in sedimentation mainly of coarse calcareous marine sandstone (unnamed), and, in the Cape Range area, of the sandstone and calcareous conglomerate of the Pilgramunna Formation. Maximum thickness encountered in WAPET wells is 900 m.

After an unconformity representing almost all the late Miocene, sedimentation began again, forming an upper Miocene‐Recent carbonate unit which includes some excellent planktonic faunas. Thickness is up to 1100 m.

Thin marine sediments of the White Mountain Formation outcrop in the Bonaparte Gulf Basin. They contain some foraminifera and a Miocene age has been suggested.     

The age,extent and geomorphological significance of the Sassafras basalt,south‐eastern New South Wales

Basalt at Sassafras was erupted in the Middle Eocene. The K‐Ar ages average 45.3 ± 4.9 Ma on whole rock and 48.4 ± 1.9 Ma on plagioclase. The basalt is not limited to a plateau capping, but extends 150 m down into adjacent valleys. Comparison with nearby Eocene basalts shows that there was in excess of 250 m of local relief in the central Shoalhaven valley by the Early Tertiary. The basalts were extruded at high elevation, and denudation of the coastal margin of the upland was already well advanced. Post‐basaltic denudation has been very slow, and the Early Tertiary landscape is well preserved.     

柴达木盆地北缘西段油气成藏机理研究

柴达木盆地北缘西段是一个以中下侏罗统煤系地层为烃源岩的含油气系统, 产油气层位主要是第三系.逆断层及相关褶皱组合构成柴北缘油气藏的主要圈闭类型.渐新世晚期(E₃2) 与上新世末到第四纪(N₂3—Q) 是柴北缘构造变形和圈闭形成的重要时期, 第三系油气成藏也主要发生在这2个关键时期.油藏原油组成和石油包裹体成分分析结果证明第三系油气藏存在不同期次的油气充注历史.下第三系的油气藏存在2期油气充注, 渐新世断层活动破坏侏罗系古油藏并连通侏罗系烃源岩, 导致古油藏中的低成熟石油和侏罗系烃源岩新生的成熟油气沿断层运移到下第三系圈闭中, 构成第1期油气充注; 上新世末到第四纪(N₂3—Q) 期间, 继续活动的断层导致侏罗系烃源岩高成熟油气沿断层运移到下第三系圈闭中, 形成第2期油气充注.上第三系油气藏主要为一期充注, 即在上新世末到第四纪(N₂3—Q) 新生断层破坏下第三系油气藏, 部分油气沿断层充注到上第三系合适的圈闭中形成次生油气藏.在柴北缘第三系油气藏形成过程中, 断层起到了重要的控制作用.