沂水南小尧金矿锆石U-Pb同位素特征及其地质意义

沂水南小尧金矿产于沂沐断裂带汞丹山凸起上,赋矿围岩为古元古代花岗岩。通过对南小尧金矿矿石中的锆石采用LA—CPMS法进行单颗粒锆石微区U—Pb同位素年龄测定,获得锆石谐和年龄（2438±13）Ma的结果,为赋矿围岩的形成年龄;而下交点（116±20）Ma大致为金矿的形成年龄。结合南小尧金矿石中钾长石矿物K—Ar年龄为（94．29±1．38）Ma的结果分析。本区金矿的形成时代应在早白垩世中-晚期。     

文登市矿山地质环境治理简析

文登市地处胶东半岛东部,矿产资源种类丰富,全市共发现矿产资源20余种,其中已开发利用的有10种,年产矿石量1000多万吨。近年来,文登市围绕增强综合竞争力和可持续发展能力,加快资源节约型、环境友好型社会建设,不断强化对矿山地质环境的保护和管理。     

文登市国土资源局强化行风建设优化服务环境

近年来,文登市国土资源局认真贯彻落实科学发展观,按照“保护资源、保障发展、依法行政、维护权益”的要求,围绕全市经济发展大局,以提升管理和服务水平为主线,改进工作作风、改善行政管理、推进依法行政,着力优化服务环境,为全市经济又好又快发展提供了有力的资源保障。2008年,在市委组织的“环境创优”评议中,位居22个执法部门第2名,被文登市委、市政府授予“优化发展环境先进单位”。     

坚持土地节约集约利用促进文登经济和谐发展

文登市位于山东半岛东部,总面积1 779.84km2。辖14个镇、3个街道办事处、2处省级开发区,810个行政村、88个居委会,总人口64.25万人,其中农村人口46.2万人。全市耕地面积62 137.93hm2,人均耕地不足0.084 hm2,低于全国和全省的平均水平,土地供需矛盾日益突出。     

上海市水源地水质综合评价方法的探讨

基于2005年至2007年上海市陈行水库和青草沙水源地的监测资料,应用基于组合权重法的水质综合评价模型对水质状况进行了综合评价。并将综合评价结果与单因子评价结果进行比较分析。研究结果表明:基于组合权重法的水质综合评价模型简便、适用,利用样本信息较为全面,能够实现对水质客观、准确、量化的分类和排序,是一种较为有效的水质评价方法。     

南海北部陆坡神狐海域晚中新世以来沉积物中生物组分变化及意义

对南海北部陆坡神狐海域4口钻孔(BY1、BY2、BY3、BY4)岩心沉积物中微体古生物的研究表明晚中新世以来该区沉积物中硅质和钙质生物组分丰度具有较大时间和空间变化。从时间上看,硅质生物在晚中新世—上新世几乎缺失,中更新世以来约40万年(0～24m)才较多出现,18万年以后繁盛,大于0.15mm粗粒级有孔虫在晚中新世期间丰度很低,而在更新世—上新世丰度很高;空间上的差异表现在不同的钻井岩心中生物丰度变化范围较大。根据硅质生物丰度变化可推测晚中新世—上新世—早更新世时海水表层古生产力极低,而中更新世以来古生产力相对较高。南海北部钙质生物丰度的变化主要受控于陆源物质的输入量,在钻探区可识别2个可能具有不同物质来源的小区块,如BY1、BY2孔晚中新世—上新世陆源物质的输入量高于更新世,BY3和BY4孔更新世陆源物质的输入量高于上新世。2007年本区钻探结果揭示的一个令人惊奇和十分独特的现象,水合物以高达20%～49%饱和度状态分散在细粒沉积物(黏土粉砂)孔隙中,本研究发现这些矿层富含钙质生物组分(钙质超微化石和有孔虫),而硅质组分贫乏。由此初步推测,大量钙质生物组分的存在可能增加了黏土粉砂沉积物的孔隙空间,从而为大...     

Rare earth elements in bottom sediments of major rivers around the Yellow Sea: implications for sediment provenance

Rare earth elements (REEs) of 91 fine-grained bottom sediment samples from five major rivers in Korea (the Han, Keum, and Yeongsan) and China (the Changjiang and Huanghe) were studied to investigate their potential as source indicator for Yellow Sea shelf sediments, this being the first synthetic report on REE trends for bottom sediments of these rivers. The results show distinct differences in REE contents and their upper continental crust (UCC)-normalized patterns: compared to heavy rare earth elements (HREEs), light rare earth elements (LREEs) are highly enriched in Korean river sediments, in contrast to Chinese river sediments that have a characteristic positive Eu anomaly. This phenomenon is observed also in primary source rocks within the river catchments. This suggests that source rock composition is the primary control on the REE signatures of these river sediments, due largely to variations in the levels of chlorite and monazite, which are more abundant in Korean bottom river sediments. Systematic variations in ΣLREE/ΣHREE ratios, and in (La/Yb)–(Gd/Yb)_UCC but also (La/Lu)–(La/Y)_UCC and (La/Y)–(Gd/Lu)_UCC relations have the greatest discriminatory power. These findings are consistent with, but considerably expand on the limited datasets available to date for suspended sediments. Evidently, the REE fingerprints of these river sediments can serve as a useful diagnostic tool for tracing the provenance of sediments in the Yellow Sea, and for reconstructing their dispersal patterns and the circulation system of the modern shelf, as well as the paleoenvironmental record of this and adjoining marginal seas.     

鄂尔多斯盆地塔巴庙地区上古生界源岩热演化特征

鄂尔多斯盆地北部主力气源岩太原组、山西组煤系地层热成熟史的研究对本区天然气充注过程和有利目标区预测具有重要的参考价值。在对研究区烃源岩评价和一维、二维地质建模研究的基础上。利用BasinMod盆地模拟软件对单井以及研究区内二维剖面、平面进行了煤系烃源岩热演化史模拟研究。研究结果表明：（1）该区在中三叠世进入生烃门限,中侏罗世以后,烃源岩持续埋深,早白垩世末期至最大埋深（4000m左右）,绝大多数的天然气都在这一阶段生成,早白垩世末构造抬升以后只有少量天然气生成;（2）研究区上古生界太原组和山西组煤系源岩最大累积生烃强度可达到2200×10^8m^3／km^2,对现今天然气的分布具有较强的控制作用。     

The protoliths to the sillimanite gneisses from the Larsemann Hills and geological implication in their formation

The source rock from which the sillimanite gneisses derive mainly was the biotite plagioclase gneiss in the Larsemann Hills. It is the deformation-metamorphism process under special pressure and temperature condition, not the original rock compositions, that controls the presence of sillimanite. To a great degree, the sillimanite gneiss was the mixture of the detaining materials of the migrating felsic melt from the bt-plagioclase gneiss that underwent partial melting and the relics when the melt was removed. In sillimanitization the original rock had been changed substantially in chemical composition. The related metamorphism process severely deviated from the isochemical series, the process was of, therefore, an open system. In addition, the Al2O3 contents of the original rock was an important, but not critical factor for the formation of sillimanite, i.e., the sillimanite-bearing rock need not be of aluminum rich in composition, and vise contrarily, the aluminum rock may not produce sillimanite. The authors of the present paper postulate that the source rock from which the aluminum rich rock derives need not be of aluminum rich, but sillimanitization is generally the Al2O3 increasing process. The aluminum rich sediments such as clay or shale need not correspond directly to sillimanite-rich gneisses. No argillaceous rock present equals to sillimanite-rich gneiss in chemical composition. The protoliths to the sillimanite gneisses from the Larsemann Hills, east Antarctica, and their adjacent area may be pelite, shale greywacke, sub-greywacke, quartz sandstone and quartz-tourmalinite. If correct, the conclusion will be of significant implication for the determination of the sillimanite gneiss formation process and the reconstruction of the protolith setting.     

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