东海盆地构造区划及其特征

东海海城构造区划可分成2个盆地和3个隆起。东海盆地可划分成6个坳陷3个隆起;进而可分为16个次一级构造单元。盆地主要构造特征是东西成带,南北分块:即一个盆地三种结构,地层时代东西分带,构造运动与岩性东西分异,地质由西向东演化史;南北在深部地质结构、力学性质及(?)闭类型。构造格局及火成岩分布、沉积环境、地热梯度等诸方面有差异.文中讨论了构造特征形成的机制及盆地内重要的矿藏资源。     

东海盆地第三纪海陆分布与油气关系探讨

本文根据东海和邻近海域数十口钻井、数万公里地球物理以及岛屿和底质等调查资料提出东海盆地早第三纪曾经历两次海侵,以始新世这期规模最大。笔者认为东海盆地杭州湾—冲绳岛断裂以北为陆相沉积区,煤系地层发育,似以气为主、油为辅的富集区;其南为海相沉积区,似以油为主、气为辅的富集区。     

Age and Origin of Paleogene Granitoids from Western Yunnan Province, China: Geochemistry, SHRIMP Zircon Ages, and Hf-in-Zircon Isotopic Compositions

We report geochemical data, SHRIMP zircon ages and Hf-in-zircon isotopic compositions for Cenozoic granitoids from major fault systems in the Tethyan belt in western Yunnan Province, southwestern China.Four magmatic pulses occurred in the Paleogene, namely at ca.57 Ma, ca.50 Ma, 45–40 Ma, and 38–34 Ma.Early magmatism of this episode(57–50 Ma) produced S-type granites whose zircons yielded εHf(t) values of-5.0 to-0.3.In contrast, late magmatism of this episode reflects heterogeneous sources.Zircons from a granite porphyry along the Ailaoshan-Red River fault system have slightly positive εHf(t) values suggesting derivation from relatively young crust and/or a juvenile source.However, zircons from a granite along the Gaoligong fault system have strongly negative εHf(t) values and suggest derivation from a Paleoproterozoic crustal source.The composition of the granitoids varies with age(from ca.57 Ma to ca.34 Ma) from peraluminous to metaluminous and also suggests a change from syn-collisional to late-orogenic tectonic setting.A new tectonic model, impacting lithospheric wedge(ILW) is shown for the origin of Paleogene granitoids in this paper.     

Early Palaeozoic Deep Subduction of Continental Crust in the Kyrgyz North Tianshan: Evidence from Field Relationships and Geochronology

<正>High-and ultrahigh-pressure(UHP)eclogite-bearing metamorphic assemblages in the North Tianshan of Kyrgyzstan contain eclogite-bearing garnet amphibolites interlayered with phengite-beearing granitoid gneisses.The mafic rocks were previously interpreted as remnants of a Precambrianm ophiolite,but field relationships clearly     

Use of N stable isotope and microbial analyses to define wastewater influence in Mobile Bay, AL

We assessed short-term ecological and potential human health effects of wastewater treatment plant (WTP) effluent by measuring δ¹⁵N‰ and microbial concentrations in oysters and suspended particulate matter (SPM). We also tested male-specific bacteriophage (MSB) as an alternative to fecal coliforms, to assess potential influence of wastewater contamination on shellfish. WTP effluent did not affect oyster growth or survival, but SPM and oysters acquired wastewater-specific δ¹⁵N‰. δ¹⁵N values were depleted near the WTP, typical of low-level processed wastewater. Fecal coliform and MSB concentrations were higher in samples taken closest to the WTP, and MSB values were significantly correlated with δ¹⁵N‰ in oyster tissues. Overall, oysters demonstrated relatively rapid integration and accumulation of wastewater-specific δ¹⁵N‰ and indicator microorganisms compared to water samples. These data suggest oysters were superior sentinels compared to water, and MSB was a more reliable indicator of wastewater influence on shellfish than fecal coliforms.     

美国主要金、银、铜、铅、锌矿床

美国地质调查局对美国大约99％的原始资源量在2t以上的金矿,８５t以上的银矿,５０００t以上的铜矿、３０００0t以上的铅矿和５００００t以上的锌矿进行了统计,从１９９６年的全国产资源评价开始,美国地调局系统地建立了这些矿床的数据库,统称为主“主要”矿床,截止至１９９６年１２月３１日,该数据库已收录了１１１８条单个矿床或矿区的记录,对于这种规模的数据主加的维护,更新和分析要比管理诸如“矿产资源数据系统”和“业地区系统”等超过１０００００条记录的数据库容易得多,然而这个主要矿床数据库却包含了美国这几种金属矿床几乎所有的历史产量和已查明的保有资源量,约有３０％的金,２２％的银,４２％的铜,３９％的铅和４６％的锌产于二战后发现的矿床中,即使在一个主要矿床发数据库中,也存在个别矿床中的历史产量及保有资源量分布不均匀的现象,每一种金属的最大１０个矿床分别拥有了美国１／３的金、６０％的角、６８％的铜,８５％的铅和７５％的锌产量,从查明的保有资源量上看,最大的１０个矿床分别占有４３％的金,５６％的银,４８％的铜,９４％的铅和７２％的锌,每一种金属的主要矿床是查明资源要低于１９９６年全国矿产资源评价对未发现矿床资源量估计的平均值,已查明资源量与累积的历史产量大体相当,假设未发现矿床中也有基本相同的资源量比例,将有大量的主要矿床有待发现。     

Semipermeable membrane devices link site-specific contaminants to effects: Part 1 - Induction of CYP1A in rainbow trout from contaminants in Prince William Sound, Alaska

Extracts from semi-permeable membrane devices (SPMDs) deployed on beaches in Prince William Sound (PWS), Alaska, were used to evaluate if complex contaminant mixtures from different sources can be distinguished by the resulting cytochrome P450 1A (CYP1A) activity in exposed test animals. Deployment sites included canneries, salmon hatcheries, and beaches where lingering oil remains from discharges during the 1964 earthquake or the 1989 Exxon Valdez oil spill. Other sites were selected at random to evaluate region-wide contaminant inputs or were located in salmon streams to evaluate contaminants carried and released by migrating salmon carcasses following reproduction. Following standard deployments of approximately 28 d, an aliquot of the accumulated contaminants was intraperitoneally injected without cleanup into juvenile rainbow trout (Oncorhynchus mykiss). After 2 d and 7 d, the activity of CYP1A was measured by the ethoxyresorufin-o-deethylase (EROD) assay. Exposure to extracts from the oiled sites and one hatchery site with numerous creosote pilings elicited strong EROD responses, whereas fish exposed to salmon stream extracts elicited weak but significant responses during late summer compared to late spring. Responses from the other sites were not significant, indicating contaminants from these sources are unlikely to cause CYP1A induction in resident biota. Rather than simply assessing extant contaminants, this method evaluates the potency of the different sites for bringing about aryl hydrocarbon receptor responses in resident biota.     

前寒武纪板块构造(续上期)

下元古宙(25-12亿年)虽然有关推测太古宙构造方面的资料很多,但是关于25亿和12亿年之间下元古宙地壳演化资料却很少。尤其25亿和22亿年之间这一时期明显缺少全球性构造—热活动或造山运动,看来好象是以巨大沉积盆地的形成为特征,其中一些是在稳定大陆壳上发展的(例如卡普瓦尔克拉通的威特沃特斯兰—文特斯多普盆地,西澳大利亚的福特斯库—哈默斯利盆地),而其余的盆地开始与显生宙板块边缘或“地槽”型层序相类似(例如西非     

Results from a sixteen year study on the effects of oiling from the Exxon Valdez on adult pink salmon returns

For sixteen years following the 1989 Exxon Valdez oil spill adult returns of pink salmon in Prince William Sound, Alaska were monitored to assess spill effects on survival. No evidence of spill effects was detected for either intertidal or whole-stream spawning fish. From 1989 through 2004 mean densities for oiled and reference streams tracked each other, illustrating similar responses of oiled and reference stream adult populations to naturally changing oceanographic and climactic conditions. Hatchery fish strayed into the study streams, but similar incursions occurred in oiled and reference streams, and their presence was compensated for to eliminate their influence on determining the success of the returning natural populations. These results, showing no detectable effects of oiling on pink salmon spawning populations, are supported by published field studies on pink salmon incubation success in oiled streams.