Polyphase Deformation of the Weihai-Rongcheng UHP Unit Rocks,NE Sulu:Insights into the Tectonic Evolution of the Dabie-Sulu UHP and HP Belts,China

Different scales of structural data reveal a complex deformation history of ultrahigh- pressure （UHP） rocks exposed in the Weihai-Rongcbeng area, NE Sulu （northern Jiangsu-eastern Shandong）, eastern China. Excluding pre-UHP deformations, at least five major sequential deformational stages （D1-Ds） are recognized. The first deformation （DO produced a weak foliation and lineation in massive eclogites. The foliated eclogite with a dominant foliation containing a stretching and mineral lineation was developed during the I）2 deformation. Both the D1 and D2 deformations occurred under UHP metamorphic conditions, and are well preserved in the eclogite bodies. D3 structures which developed shortly after the formation of granulite/amphibolite facies symplectites are characterized by imbricated associations marked by a regional, steeply dipping foliation, compositional layering, eclogite boudinage, isoclinal folds and reverse ductile shear zones. The D3 deformation was accompanied by decompressional partial melting. A regional, gently dipping amphibolite facies foliation and stretching lineation, low-angle detachments, and dome- and arc-shaped structures formed during the D4 deformation stage dominate to some degree the map pattern of the Weihai-Rongcbeng UHP domain. The last stage of deformation （Ds） gave rise to the final exhumation of the UHP rocks. Ds is characterized by development of brittle-dominated high-angle faulting associated with emplacement of large volmnes of undeformed granite plutons and dykes dated at 134-100 Ma. The deformational and metamorphic sequence followed by the UHP rocks in the Weihai-Rongcheng area is similar to that studied in the entire Dabie-Sulu UHP and HP metamorphic belts from microscopic to mapping scale. Based on structural data, combined with available petrographic, metamorphic and geochronological data, a speculative tectonic evolutionary model for the Dabie-Sulu UHP and IIP belts is proposed, involving continental subduction/collision between the Sino-Korean and Yangtze cratons and subsequent polyphase exhumation histories of the UHP and IIP metamorphic rocks.

榴辉岩退变质过程的地球化学研究——以荣成-威海岩段的榴辉岩体为例

苏鲁超高压 -高压变质岩带为 A型俯冲作用的产物。带内的榴辉岩体多发生退变质作用 ,形成退变榴辉岩、榴闪岩及斜长角闪岩等 ,与榴辉岩一起记录了高压 -超高压进变质峰期经过构造回返减压、降温演化过程所发生物质成分交换的重要信息。本文以荣成-威海岩段具“核 -壳”构造的榴辉岩体为例 ,依据地质、岩相学特征 ,进行了退变质过程元素地球化学变异的深入研究。该过程中主要元素 K,Ba,Rb等大离子亲石元素及 w(K2 O) /w(Na2 O) ,w(Fe2 O3) /w(Fe O) ,w (L REE) /w(HREE)的增加 ,体现壳源物质的加入 ;成矿元素 Zn等明显增加 ,Ni,Co,Cr,Cu降低并均进入围岩或聚集于外壳斜长角闪岩中。这一规律不仅反映伴随构造折返、环境向相对氧化环境变化 ,不仅地壳物质及流体成分加入、发生广泛的物质交换 ,而且揭示了这一过程壳 -幔物质交换的成岩成矿规律。

莱荣铁路引入威海铁路地区方案研究

莱荣铁路是胶东半岛南部沿海地区对外客运交流的主要通道,是对山东半岛地区高速铁路网运能的有效补充。通过分析莱荣铁路引入威海铁路地区影响,对威海铁路地区旅客列车对数进行预测,提出莱荣铁路引入威海铁路地区的接轨方案,经比选推荐采用荣成站接轨方案。在此基础上,提出荣成站改造方案,经比选推荐采用正线临靠站台方案为荣成站改建方案,为完善威海综合交通网络,全面推进威海市“全域城市化、市域一体化”战略奠定基础。

山东省威海—荣成地区金矿找矿方向

胶南—威海造山带研究区内重要的金及多金属成矿区带。特殊的大地构造位置,经历了多期构造运动和韧性变形作用,构造形迹复杂,形成了一系列韧性变形带和脆性断裂构造,成矿地质条件较好。

莱荣铁路引入威海地区方案研究

莱荣铁路位于山东省胶东半岛东南部沿海地区,是胶东半岛东南部沿海地区对外客运交流的主要通道。结合区域城市概况、既有铁路情况,主要从旅客吸引范围、运输组织、运营长度和运营时间、工程实施难易程度、工程投资等因素考虑了引入威海地区方案的选择,并最终确定荣成站接轨设文登南站方案(方案I)为推荐方案。

2014、2015年青烟威荣城际铁路新建车站生活饮用水卫生检测

目的了解青烟威荣城际铁路新建车站供水卫生情况,为车站供水卫生管理提供科学依据。方法收集分析2014、2015年青烟威荣城际铁路新建车站的供水验收检测报告。结果部分车站生活饮用水检测项目超标,超标项目为菌落总数(370~1 300CFU/ml)、游离余氯(0.01~0.04mg/L)、铝(0.26mg/L)、锌(1.49mg/L)、氟化物(1.97mg/L)、铁(0.31~0.53mg/L)、总大肠菌群(9~14CFU/100ml)、硝酸盐氮(24mg/L)。结论青烟威荣城际铁路新建车站生活饮用水整体状况较好,但少数车站有超标情况。