柴西南翼山构造上新统狮子沟组混积岩地球化学特征及物源指示意义

柴西地区南翼山构造上新统混积岩中含有大量盐类矿物,其物源分析对盐矿物质来源研究有一定的参考价值。本文在野外观察和镜下鉴定的基础上,对南翼山构造上新统狮子沟组混积岩的地球化学特征进行了分析,并结合周缘造山带花岗岩的稀土元素数据,探讨了混积岩中陆源碎屑的物质来源。结果显示：南翼山构造狮子沟组混积岩中碎屑矿物、碳酸盐矿物和黏土矿物呈均匀混合的状态,元素含量与矿物组分密切相关,除Ca、Na、Sr元素外,其余元素含量普遍低于上地壳平均含量,其中CaO和Na2O受碳酸盐和石盐形成影响,不能用于判别构造背景,而Sc、Th、Zr、Hf等微量元素和稀土元素较完整地保留了源岩的地球化学信息,可用于源区构造背景的判别及物源示踪,同时稀土元素配分模式一致性较好,表明混积岩中陆源碎屑具有相同的物源特征。稀土元素配分模式、La Th Sc、Th Sc Zr/10、La/Th Hf图解以及Al2O3/TiO2比值共同指示南翼山混积岩的陆源碎屑组分来源于大陆岛弧背景下的长英质火成岩,通过与周缘造山带花岗岩稀土配分模式对比,推断晚志留世和晚二叠世花岗岩是混积岩中陆源碎屑和盐类矿物的主要源岩,南部的祁漫塔格是主要的物源区,且西部的阿尔金南段也有部分物源贡献。     

川东北普光地区新型杂卤石钾盐矿的物源:Sr、S同位素证据

新型杂卤石钾盐矿是近年来发现于四川盆地东北部早—中三叠世的一种可溶性海相固体钾盐,因其可利用性及低成本可开采特征,及其对海相找钾实现突破性进展提供的指示意义,引起了工业界及学术界的广泛关注。但当前以新型杂卤石钾盐矿为载体的海相成钾理论研究尚处于探索阶段,本文聚焦川东北普光地区中下三叠统新型杂卤石钾盐矿,将锶、硫同位素研究方法应用于杂卤石碎屑、石膏及"绿豆岩"等样品,以探讨新型杂卤石钾盐矿中不同组分的物源特征。分析结果显示,杂卤石碎屑和矿层底部硬石膏样品具有相似的δ³⁴S和⁸⁷Sr/⁸⁶Sr同位素特征,δ³⁴S分布在27.9‰~28.9‰之间,⁸⁷Sr/⁸⁶Sr介于0.70826~0.70829之间。该研究结果与同时期全球海相硫酸盐的δ³⁴S和全球海水的⁸⁷Sr/⁸⁶Sr的可对比性表明上述组分的主要物源应为同时期海水。该研究结果为进一步新型杂卤石钾盐矿成矿模型的建立及海相成钾理论的补充和完善提供了一定的参考。     

Insights about the structure and development of Zhongsha Bank in the South China Sea from integrated geophysical modelling

ABSTRACT

We construct a complete density transection based on the velocity structures across the Zhongsha Bank in the South China Sea. Gravity modelling of the lateral density contrasts between tectonic units helps us to determine the structural attributes and boundaries between continental blocks and deep basins. The configuration of the continent–ocean boundary (COB) around the Zhongsha Bank is mapped based on the gravity/magnetic anomaly and crustal structures. A low-density mantle is found beneath the Zhongsha Bank and the oceanic basins, and this mantle is associated with the high heat-flow background. The COB orientation is northeast-east in the north of the bank, with faulted linear structures. In further southeast, where there is a more intact crust, the COB orientation changed to north-northeast. The reconstructed density model and gravity/magnetic map indicate that the Zhongsha Bank is conjugated with the Liyue Bank by a rifted basin, where the crust had experienced localized deformation before the seafloor spreading. Because of the insufficient magmatism in the oceanic basin, the spreading ridge propagates into the weakened continental lithosphere between the two continental blocks, thus completely separating the Zhongsha Bank from the Liyue Bank. Seafloor spreading ridge jumps within the South China Sea may also be affected by the heterogeneous lithosphere beneath the continental blocks and oceanic basins.     

深部煤层采动破坏电位响应特征与分布规律

为了研究采动破坏过程煤体电位信号的响应特征与规律,利用自主研发的矿用电位仪在河南薛湖煤矿25050综采工作面进行了现场测试。结果表明:煤层采动破坏过程能够产生显著的电位信号,电位响应特征能够揭示煤体应力状态的变化,随着回采工作面的推进,电位强度呈先增加后降低趋势,利用钻孔卸压后,煤体应力降低,电位信号随之下降;电位强度与钻屑量的空间分布规律基本一致,利用电位空间分布规律能够识别应力异常特征,出现“卡钻”现象时,煤体应力异常,电位强度出现峰值;当瓦斯指标超限或出现大能量煤炮事件时,电位信号呈超前增大趋势并伴随剧烈波动,利用电位信号能够识别煤岩动力灾害危险的前兆特征。研究成果表明利用电位手段可现场监测煤体采动破坏、预警煤岩动力灾害。      

鄂尔多斯盆地变质基底中碎屑锆石的LA ICP MS U Pb年龄及其构造意义

根据鄂尔多斯盆地东北部钻孔的资料显示,鄂尔多斯盆地基底主要由一套变质沉积岩组成,对其中的二云母斜长片麻岩和矽线石片麻岩样品进行LA-ICP-MS锆石U-Pb年代学研究,两件样品单颗粒碎屑锆石共获得96个具有地质意义的年龄资料。二云母斜长片麻岩的部分锆石显示清晰的韵律环带,具有岩浆锆石的特征,其获得的207Pb/206Pb年龄介于1898.2~2047.2Ma之间,综合前人的研究数据,显示鄂尔多斯盆地基底东北部在古元古代2.0~2.1Ga左右曾有岩浆活动。二云母斜长片麻岩的部分锆石和矽线石片麻岩的锆石具有变质锆石特征,获得的变质锆石年龄数据支持鄂尔多斯盆地东北部在古元古代发生过两期变质作用,早期的变质作用峰值年龄约为1.83Ga,代表着东部陆块和西部陆块碰撞拼合这期构造事件;晚期变质作用发生在约1.78Ga,可能记录了这一阶段的拉张抬升事件。     

A nonlinear microseismic source location method based on Simplex method and its residual analysis

Source location is one of the most valuable features of the microseismic technique due to its ability to delineate the unstable areas. In this paper, the precise formulas of the station residual and event residual are derived for the L1 norm statistical standard and the L2 norm statistical standard based on the residual analysis. Then, the error space for microseismic source location is proposed and analyzed. Based on the above research, a nonlinear microseismic source location method using the Simplex method is developed. This new method can search the microseismic source directly in the error space through four deformations of the simplex figures, and it is able to make use of both P-wave and S-wave velocities. Finally, the performance of the Simplex microseismic source location method is tested and verified by laboratory experiments. Test results show that the Simplex microseismic source location method can improve the accuracy and stability of the source location greatly when P-wave and S-wave velocities are involved simultaneously and correctly. The results also demonstrate that the L1 norm statistical standard always provides more accurate and reliable solutions than the L2 norm statistical standard when there are some major but isolated errors in the input data. However, none of the optimization methods are able to function when the errors in the input data are systematic and extreme, which indicates that an early detection and correction of these errors is of primary importance for microseismic source location.     

Sr Isotope Geochemistry and Depositional Setting of Carbonate in Ordovician,Ordos Basin,China

正China is in severe shortage of potash reserves,and the best way for breakthrough is to make potash exploration in marine salt basins.Erdos basin is so far the only Ordovician potash basin in the world.The Erdos basin is located west