甘肃合作早子沟金矿微量元素、同位素特征与成矿物质来源

甘肃合作早子沟金矿是西秦岭夏河—合作金矿富集区最著名的特大型金矿床,经过近20年持续勘查,已探明资源量超过150 t。笔者等通过对2018~2021年实施的深部科研钻探SDZK8314岩芯进行系统编录和测试分析,为研究深部流体和成矿物质来源提供新的资料。研究表明,早子沟金矿中不同类型的岩石与矿石的稀土微量元素具有相似配分曲线特征,含矿岩石相对围岩具有明显更低ΣREE含量和更高的K、Sr含量,同时矿石中的金品位与K2O含量呈现明显的正相关关系。早子沟金矿中的石英闪长玢岩n(208Pb)/ n (204Pb)=38.33~38.48、黄铁矿—毒砂n(208Pb)/ n (204Pb)=38.23~39.19、辉锑矿n (208Pb)/ n(204Pb)=37.75~38.63,具有多源、混合铅的特征,从闪长玢岩黄铁矿—毒砂辉锑矿具有从上地壳到造山带甚至地幔的演化趋势。H—O同位素显示,成矿流体主要来源于岩浆水,后期有大气降水和围岩循环水的混入。矿石中δ34SV CDT值的范围为-14.7‰~-7.0‰,平均值-10.3‰,硫主要来源于岩浆热液,与围岩发生强烈的水岩反应而带入一部分地层硫。早子沟金矿的形成与区域较晚期岩浆—构造活动直接相关,成矿物质主要来源于深部石英闪长岩。     

崇明与南京台震前地电场变化异常分析

2001年11月3日和12月25日江苏南通地区分别发生了ML3.8和ML4.1的地震群事件. 本文以上海崇明地电场台和南京地电场台ZD9A大地电场仪的观测资料为研究对象，在阐述了多极距地电场观测去噪音原理的基础上, 研究了这两个台站地电场多极距观测系统的资料在震前的异常变化特征. 结果表明: ① 多极距观测去噪音方法是一种很好的识别地电场噪音的方法；② 在震前20天、2天及42天离震中较近的崇明台NS和NE方向上分别接收到了地震电信号, 其持续时间最长的为9天，而较远的南京台出现的异常信号都是噪音信号而非地震电信号；③ 地电场多极距观测系统中公用电极的布极方式是不可取的.      

Kalligrammatid Lacewings from the Upper Jurassic Daohugou Formation in Inner Mongolia, China

A new species, referable to a new genus, is erected, and named the Sinokalligramma jurassicum gen. et sp. nov. It is the second finding of kalligrammatids in the Daohugou Formation. The origin and migration of the family Kalligrammatidae are discussed. The geological age and stratigraphic correlation of the Daohugou and Karabastau Formations are briefly reviewed and reassessed.     

Geochemistry of Mesoproterozoic Volcanic Rocks in the Western Kunlun Mountains: Evidence for Plate Tectonic Evolution

Mesoproterozoic volcanic rocks occurring in the north of the western Kunlun Mountains can be divided into two groups. The first group (north belt) is an reversely-evolved bimodal series. Petrochemistry shows that the alkalinity of the rocks decreases from early to late: alkaline→calc-alkaline→tholeiite, and geochemistry proves that the volcanic rocks were formed in rifting tectonic systems. The sedimentary facies shows characteristics of back-arc basins. The second (south belt) group, which occurs to the south of Yutian-Minfeng-Cele, is composed of calc-alkaline island arc (basaltic) andesite and minor rhyolite. The space distribution, age and geochemistry of the two volcanite groups indicate that they were formed in a back-arc basin (the first group) and an island arc (the second group) respectively and indicate the plate evolution during the Mesoproterozoic. The orogeny took place at -1.05 Ga, which was coeval with the Grenville orogeny. This study has provided important geological data for explorin     

江苏省国土资源省-市-县三级公文协同办理系统结构设计研究

本文通过对江苏省国土资源电子政务建设思路的阐述,对全省各级国土资源部门信息化现状差异的分析,设计了全省三级公文协同办理系统的框架,并逐层深入设计了三大核心软件系统的结构,最后结合全省应用实例,介绍了本系统结构的应用情况。     

苏北盆地高邮凹陷侵入岩形成时期及成因机制探讨

通过对苏北盆地高邮凹陷的上、下两套侵入岩与断层的错断及其与构造运动强弱的关系、与油气成藏期的关系以及侵入岩的平面分布研究,提出了侵入岩的侵入时期为三垛期,而非盐城期。通过对晚白垩世以来苏北盆地各期构造运动及其伴生火山活动的分析,认为高邮凹陷侵入岩的成因主要由于晚始新世至渐新世末,该区发生了三垛运动,并发育一系列北东及北西向的断裂构造,导致了岩浆活动,并以侵入特征为主。     

高邮凹陷北斜坡中部泰州组烃源岩评价

通过对高邮凹陷北斜坡中部沙埝地区沙50A井泰二段暗色泥岩系统取样,详细评价了其有机质丰度、类型、成熟度等各项指标,并依据泰州组烃源岩评价结果和成熟门限深度值划定了高邮凹陷泰州组有效烃源岩的分布范围,计算了相应的资源量。结果表明,该区泰州组有效烃源岩主要分布于泰二段底部六尖峰泥灰岩段,该段有机质丰度较高,类型较好,具有较好生油能力;该区泰二段烃源岩已处于成熟阶段,对应门限深度为2550m;有效烃源岩集中分布于高邮凹陷北斜坡中东部地区,生油量为2.9×10~8t,占高邮凹陷总生油量的60%,具有较大的勘探潜力。     

Underwater Explosion Treatment of Marine Soft Foundation

The consolidation of soft foundation is a problem that commonly appears in harbor construction engineering on muddy coast. Introduced in this paper is the experimental study on underwater explosion treatment of soft foundation, including the regulations of explosion hollow development and medium movement, the law of similarity of densification and settlement of filled stone mass by shock wave pressure and explosion energy and their construction technologies, etc. A number of projects have been completed by applying this new technique, and the technique itself has been proved practicable.     

微体化石研究中应注意的问题

多数微体化石仅是生物体的一部分，我国微体古生物学家对生物整体或器官的研究不够，相当多的作者仍在命名大量的形态属种，落后于世界古生物学的发展现状。微体化石是重要的，但微体古生物学家不能过份强调微体化石的重要而忽视与大化石和岩相研究的结合。在化石处理和鉴定过程中，由于微体古生物研究者对混杂问题注意和警惕不够，以至混入现代生物，误作化石。我国小壳化石的新属中，至少有５个属都是现代植物的种子或颖果，有的属     

On the Age of the Ophiolitic Complexes in Northeastern Jiangxi:A Micropaleontological Analysis

The age assignment of cherts from ophiolitic/metamorphic complexes in northeastern Jiangxi is widely regarded as one of the crucial issues in the tectonic interpretation of South China. The ophiolitic and metamorphic complexes in northeastern Jiangxi have been traditionally regarded as part of the Proterozoic “Banxi (=Penhsi) Group” of the Jiangnan Uplift. However, recent reports of Late Paleozoic radiolarians from the rock complexes have caused some researchers to question the traditional interpretation of the tectonic and paleogeographic framework in the region; but other workers are suspicious about these findings. In order to test the validity of the putative radiolarians, we, an interdisciplinary study group including micropaleontologists, tectonic specialists and regional geologists, conducted field investigations and multiple re-samplings of the localities where the reported fossils were collected. Our comprehensive study shows that the chert of the ophiolitic complex and the associated low-grade metamorphic slate yield Mesoproterozoic and Neoproterozoic acritarchs, confirming the traditional view of their age assignment (Proterozoic); on the other hand, no recognizable radiolarian fossils have been discovered therein, thus raising questions about the recently published result of Paleozoic radiolarian findings. Probable causes for the putative radiolarian findings are thus discussed herein. Geochemical characteristics indicate that the chert sedimentation most probably occurred under a continental margin setting.