黄海及其沿岸历史地震初步研究

黄海及其边缘，经历史地震资料整理，地震参数估定与编目，截至1949年8月，共有M≥3级地震2187次，其中M≥43/4级地震259次，资料显示大致有三个相对集中活跃区，16世纪曾有过历史地震活动高潮。     

胶东地区控矿剪切带脆性变形时代的Ar-Ar年代学及其对成矿的制约

胶东地区是典型的剪切带型金矿集中区,精确厘定该地区控矿剪切带的活动时代,可为探讨剪切带与金矿成因关系提供关键的时限约束,并且对矿床成矿模式的建立具有至关重要的意义。大量矿床地质证据显示胶东地区控矿剪切带中脆性变形活动对金矿体的形成具有直接影响,但其脆性变形时代尚不十分清楚。据此,本文在详细研究金矿体赋存特征的基础上,系统选取胶东焦家、玲珑、邓格庄、乳山这四个金矿区控矿剪切带断层泥中白云母进行⁴⁰Ar-³⁹Ar年代学研究。定年结果显示,胶东地区焦家剪切带、招平剪切带以及牟乳剪切带的脆性变形时代分别为110.3±1.5Ma、122.8±1.7Ma、119.6±1.2Ma~115.8±1.4Ma。其中焦家剪切带的脆性变形时代明显晚于招平和牟乳剪切带,可能代表了焦家蚀变岩型矿化形成后易遭受后期的构造叠加。综合胶东各金矿区控矿剪切带变形时代、岩体侵位时代、成矿时代及剪切带活动特征和矿体产出特征,本文认为在多期岩体侵位以及控矿剪切带递进变形过程中,剪切带韧性变形区中由高压流体作用产生的同期脆性破裂可形成脉型矿化,如乳山金矿;而在脆-韧性和脆性变形区中发生的大规模脆性变形可导致脉型和蚀变岩型矿化的形成,如玲珑、邓格庄和焦家金矿。但随着剪切带的递进变形和隆升剥蚀,后期多期次的脆性构造变形叠加,可导致多种矿化类型出现在同一构造部位,如焦家金矿中石英脉型和蚀变岩型矿化。

     

1998年地面加热场的基本特征及其与南海夏季风爆发的可能联系

文中对 1 998年 1月 1日到 8月 31日共 2 4 3d的南海季风试验再分析资料的地面感热场和潜热场进行 EOF分析 ,由感热的第一特征向量场发现 ,中南半岛地区、青藏高原的东北部和印度半岛的大部分是感热通量大值区 ,而海洋上是小值区 ,海陆热力差异十分明显 ,这种海陆感热对比是促使季风爆发的大背景。由感热的时间经度演变图可以看出 ,中南半岛所在经度范围内南北连续的感热分布对南海季风的早爆发具有重要作用。由温度平流项的分布可发现 ,中南半岛的加热作用明显早于青藏高原地区 ,使得中南半岛对南海季风的早期爆发有重要作用 ,而青藏高原对于南海季风的维持具有重要意义。由于印度半岛与中南半岛的海陆分布的差异 ,使得两个地区的温度平流项也有所不同     

短波红外光谱、X射线荧光光谱、黄铁矿热电性分析在胶东新城金矿田深部找矿中的应用

胶东半岛是我国最重要的金矿集区之一,其矿床是典型受北东向断裂构造(焦家断裂带、三山岛断裂带和招平断裂带),以及次生断裂构造(如望儿山断裂和灵北断裂等)控制的矿床类型.前人在该区域做了大量研究,但主要集中在地表和浅层成矿段,对于深部成矿规律与预测的研究相对较少.新城金矿田是胶东半岛的特大型金矿之一,由新城矿床、曲家矿床和...     

东南亚中南半岛锡矿带成矿特征

东南亚中南半岛位于特提斯成矿域和西环太平洋成矿域的相交地带,在印支—喜山期发生了多期次俯冲、碰撞造山成矿作用,发育多个与中酸性岩浆活动密切相关的锡(钨)岩浆热液成矿系统,形成了世界著名的东南亚中南半岛锡矿带。研究区自西向东依次可划分为抹谷—毛淡棉—德林达依—普吉锡矿带、景栋—清莱—清迈锡矿带和越北—长山—昆嵩—大叻锡矿带三大锡矿带及7个锡矿亚带,锡矿化花岗岩多为高度分异演化的重熔型铝过饱和花岗岩类,具有多硅、富碱、多挥发分、高钾、87Sr/86Sr初始比值高、Rb/Sr值高、相对明显富集Be、Bi、Cu、Mo、Pb、Sn、Y、Zn等元素的特点。锡矿体主要分布于S型花岗岩与围岩的内、外接触带。锡矿床成矿类型主要有热液脉型、矽卡岩型、锡石—硫化物型、云英岩型、伟晶岩—细晶岩型等。从海西晚期到喜山早期都有锡的成矿事件发生,以燕山期锡成矿作用为主,成矿构造环境主要为岛弧环境和大陆边缘碰撞造山环境。     

朝鲜半岛平南盆地中元古代岩浆事件

朝鲜平南盆地翁津地区发育中元古代黄海群和同时期(称之为瓮津期)花岗岩,花岗岩体侵入于黄海群。本文采用锆石原位微区U-Pb定年技术,对黄海群中的酸性火山岩及花岗岩进行了年龄测试。获得的数据表明,黄海群中下部层位及上部层位的酸性火山岩分别在1235±5Ma和1203±7Ma喷发,由此说明黄海群的沉积时代应为中元古代,而不是传统上认为的古元古代;两个翁津期花岗岩体(翁津和黄衣山岩体)的侵位年龄分别为1251±22Ma和1248±13Ma,为中元古代花岗质岩浆活动的产物。上述1251~1203Ma年龄的获得,表明朝鲜半岛发育中元古代岩浆作用,从而明确朝鲜黄海裂谷与华北东缘裂谷在时间上具有同期性,同时也表明中国华北与朝鲜在中元古代具有类似的发展历史。     

Late Eocene–early Miocene provenance evolution of the Crocker Fan in the southern South China Sea

There are many large-scale Cenozoic sedimentary basins with plentiful river deltas, deep-water fans and carbonate platforms in the southern South China Sea. The Crocker Fan was deposited as a typical submarine fan during the late Eocene–early Miocene, and stretches extensively across the entire Sarawak–Sabah of the northern Borneo area. However, systematic analyses are still lacking regarding its sediment composition and potential source suppliers. No consensus has been reached yet on the provenance evolution and sedimentary infilling processes, which seriously impeded the oil-and-gas exploration undertakings. By combining with sedimentary-facies identification, heavy mineral assemblages, elemental geochemistry and detrital zircon U-Pb dating, this paper aims to generalize an integrated analysis on the potential provenance terranes and restore source-to-sink pathways of the Crocker Fan. In general, the Crocker Fan was initially formed over the Cretaceous–lower/middle Eocene Rajang Group by an angular Rajang unconformity. The continual southward subduction of the proto-South China Sea resulted in magmatic activities and subsequent regional deformation and thrusting along the Lupar Line in the northern Borneo. The lowermost Crocker sequence is featured by a thick conglomerate layer sourced from in-situ or adjacent paleo-uplifts. From the late Eocene to the early Miocene, the Crocker Fan was constantly delivered with voluminous detritus from the Malay Peninsula of the western Sundaland. The Zengmu Basin was widely deposited with delta plain and neritic facies sediments, while the Brunei-Sabah Basin, to the farther east, was ubiquitously characterized by turbiditic sequences. The Crocker Fan successions are overall thick layers of modest-grained sandstones, which formed high-quality reservoirs in the southern South China Sea region.     

4—5月南亚高压在中南半岛上空建立的年际变化特征及其与亚洲南部夏季风的关系

利用1979--2008年NCEP／NCAR逐日再分析资料和向外长波辐射资料讨论了4-5月南亚高压在中南半岛上空建立的年际变化特征及其与亚洲南部夏季风的关系。发现南亚高压建立偏早年其建立过程时间长,中南半岛高空反气旋环流强,建立开始前位于菲律宾群岛以东洋面上空的反气旋环流中心位置较为偏西;偏晚年南亚高压建立过程时间短,中南半岛高空反气旋环流弱,建立开始前西太平洋上空无闭合的反气旋性环流中心。南亚高压建立的早晚与中南半岛地区对流建立发展关系密切,当中南半岛地区对流建立发展较早时,南亚高压建立较早;反之,对流建立发展偏晚时,南亚高压建立偏晚。南亚高压建立早晚年,亚洲南部夏季风的爆发存在明显差异。南亚高压建立偏早年,孟加拉湾东部一中南半岛夏季风和南海夏季风爆发早;建立偏晚年,孟加拉湾东部一中南半岛夏季风和南海夏季风爆发晚,因此南亚高压在中南半岛上空建立的早晚对后期亚洲南部夏季风的爆发具有较好的指示意义。     

山东半岛近岸海域蟹类群落结构特征的研究

根据2014年8月和10月、2015年2月和5月使用单船底拖网进行的4个航次调查数据,对山东半岛近岸海区的莱州湾及渤海南部、山东半岛北部和山东半岛南部等3个海域蟹类种类组成、时空分布、优势种、群落结构稳定性等群落结构特征进行了研究。结果显示,4次调查共捕获蟹类20种,隶属于10科17属,其中日本蟳（Charybdis japonica）和三疣梭子蟹（Portunus trituberculatus）是主要经济种类,其余均为小型饵料型蟹类;海区内主要的优势种为双斑蟳（Charybdis bimaculata）、日本蟳（Charybdis japonica）和三疣梭子蟹（Portunus trituberculatus）,3个海域优势种季节更替均十分明显;莱州湾及渤海南部和山东半岛南部2个海域生物量季节变化明显,春季较低,在夏季达到峰值,夏季到冬季呈降低趋势,山东半岛北部海域生物量季节变化不明显。3个海域蟹类群落物种多样性指数（H'）、丰富度指数（D）及均匀度指数（J'）均处于较低水平,并有一定的季节变化;水深、水温和盐度是影响蟹类群落结构的重要因子,渤莱沿岸流、黄海暖流和黄海冷水团通过影响海域内水温与盐度影响蟹类群落结构。研究表明山东半岛近岸海区蟹类以小型饵料型蟹类为主,蟹类多样性水平较低,优势种更替明显,群落季节更替指数较高,季节间迁移频繁,蟹类群落不稳定。     

Current Nature of the Kuroshio in the Vicinity of the Kii Peninsula

The Kuroshio flows very close to Cape Shionomisaki when it takes a straight path. The detailed observations of the Kuroshio were made both on board the R/V Seisui-maru of Mie University and on board the R/V Wakayama of the Wakayama Prefectural Fisheries Experimental Station on June 11–14, 1996. It was confirmed that the current zone of the Kuroshio touches the coast and bottom slope just off Cape Shionomiaki, and that the coastal water to the east of the cape was completely separated from that to the west. The relatively high sea level difference between Kushimoto and Uragami could be caused by this separation of the coastal waters when the Kuroshio takes a straight path. This flow is rather curious, as the geostrophic flow, which has a barotropic nature and touches the bottom, would be constrained to follow bottom contours due to the vorticity conservation law. The reason why the Kuroshio leaves the bottom slope to the east of Cape Shionomisaki is attributed to the high curvature of the bottom contours there: if the current were to follow the contours, the centrifugal term in the equation of motion would become large and comparablee to the Coriolis (or pressure gradient) term, and the geostrophic balance would be destroyed. This creates a current-shadow zone just to the east of the cape. As the reason why the current zone of the Kuroshio intrudes into the coastal region to the west of the cape, it is suggested that the Kii Bifurcation Current off the southwest coast of the Kii Peninsula, which is usually found when the Kuroshio takes the straight path, has the effect of drawing the Kuroshio water into the coastal region. The sea level difference between Kushimoto and Uragami is often used to monitor the flow pattern of the Kuroshio near the Kii Peninsula. It should be noted that Uragami is located in the current shadow zone, while Kushimoto lies in the region where the offshore Kuroshio water intrudes into the coastal region. The resulting large sea level difference indicates that the Kuroshio is flowing along the straight path.