蒙阴县丁家庄地区铜矿（化）地质特征及成矿条件探讨

通过对蒙阴县丁家庄地区地层、构造、岩浆岩、地球化学特征、地球物理特征和矿体特征的论述,对该矿的成矿地质背景进行了探讨;认为丁家庄地区具有以金银铜铅锌为主的多金属综合异常,异常套合较好,矿化明显,是寻找铜及多金属矿的有利靶区,找矿前景较好。     

南秦岭勉略蛇绿构造混杂带辉长辉绿岩类微量-稀土元素地球化学

应用元素地球化学方法．研究了勉略带中辉长辉绿岩的相关特征．结果表明．勉略蛇绿构造混杂带内的辉长岩属高铝强碱质辉长岩类，是地幔橄榄岩部分熔融的产物。辉绿岩墙群属强碱铝质基性岩类，过渡族元素蛛网图与辉长岩类几乎完全相同，其不相容元素与辉长岩类总体趋势相一致．反映了一种递进岩浆演化趋势。因此，本区辉长岩与辉绿岩墙群具同源岩浆分异演化的地球化学特征．其均为勉略蛇绿岩的重要组成端元。     

秭归盆地东缘断裂构造觅踪——再论仙女山断裂带北延过长江问题

文章在概略介绍仙女山断裂带所处的大地构造位置、展布特征、组合关系基础上,用详实的材料,逐一分析了荒口—腰店子、腰店子—将军垭、将军垭—卜庄河及尹家湾—黄垭畔、黄垭畔—贾家店长江南北两岸各段的断裂构造形迹特征、力学性质和交切关系。认为仙女山断裂带已北延过长江,并建议对断裂的应力传递方式和可能出现的史前地震进行深入研究。     

常德1631年大震事件的多场点群发式构造模型

根据对常德1631年地震事件的史料鉴别,尤其是江陵为典型七度震害这一事实,运用震声传播方向和地光物理场以及地震烈度衰减关系,拟合推断此地震事件的序列主要由安乡北6 3/4级地震、常德北太阳山7级地震、澧县6级地震、大庸6级地震和澧县—安乡6 1/2级地震组成,相应的地震地质背景是江汉—洞庭地区晚更新世以来的剩余形变呈四象限分布。若考虑地震-构造相关分布为“Z”字型,则该地震事件的主控构造——太阳山断裂带东断裂具左旋走滑的力学机制。根据区域地震—构造相关发展过程,常德大震事件可视为1668年郯城8 1/2级地震的前震序列组成部分。     

横贯中国东南部的一条古断裂带

本文根据地质和物探资料,论证横贯中国东南部桂西、黔东南、湘西北、鄂东南、赣西北、皖东南和苏南的湘黔-江南古断裂带。中元古代为超壳断裂,古生代属壳断裂,是一条长期发展的控岩控矿的古断裂带。往东入海,延向济州岛和西南日本飞驒地区。     

滇西地震预报实验场场区水平形变分析

利用场区各种类型水平形变网数据，求得红河断裂中、北段的区域应力场基本特征是：（１）北区为张性左旋型，（２）中区为压性右旋型，（３）南区为张性右旋型。场区区域应力场基本以张性为主，中区的压性右旋型恰好反映转换区应力场的局部特征。北区主应变积累和速率比南区大，最大处在剑川，而高敏感区在后山定两岭。基于水平形变和应变分析，获得了场区现今主要活动构造参数。利用地震前兆形变信息和震后效应进行了地震震例分析。并对３～５年内的潜在震源区进行了预估。     

辽南北瓦沟长英质岩石应变组构演化

岩石的应变组构型式与岩石成分、变形环境和应变过程有着密切关系。北瓦沟地区低角闪岩相条作下的长英质岩石,表现脆性、韧性和韧脆性过渡,因而在剪切作用过程中形成了相应的应变组构型式,即脆性应变组构、韧性应变组构和脆-韧性应变组构。而且随着应变过程的发展,应变组构也表现出一定的演化规律。     

天津潮间带春季贝类资源调查

为研究天津潮间带贝类资源的分布特征,2017年5月,作者对天津滩涂开展贝类资源调查。共采集贝类30种,分属2纲、4亚纲、10目、19科,在汉沽鲤鱼门、大港减河口、大港滨海湿地分别采集贝类20种、19种、19种;高潮区、中潮区、低潮区分别采集贝类11种、22种、10种;H'值大小顺序为鲤鱼门滨海湿地减河口,中潮区高潮区低潮区;经济贝类主要分布于中潮区,鲤鱼门与减河口滩涂的优势经济种均为菲律宾蛤仔(Ruditapes philippinarum),生物量分别为562.8、828.5 g/m~2,滨海湿地的优势经济种为四角蛤蜊(Mactra veneriformis),生物量为1 403.8 g/m~2。对比2013年,大港减河口滩涂的贝类种数及生物量均升高,鲤鱼门滩涂的贝类种数增加,滨海湿地滩涂的贝类资源为首次报道。     

鲢鱼抗氧化肽对冷藏鲅鱼肉脂质氧化的影响

研究鲢鱼抗氧化肽对冷藏鲅鱼肉脂质氧化的抑制效果和保鲜效果.将不同浓度的鲢鱼抗氧化肽(SAP)添加到鲅鱼肉中,测定了该鱼肉冷藏期间(2 ℃,12 d)的脂质水解产生的游离脂肪酸(FFA)的含量、二级氧化产物的量(TBA-i值)、初级氧化产物的量(过氧化值:POV)、产生的荧光物质的量及多烯指数(PI)等变化.结果表明,不同浓度的SAP对冷藏期间鱼肉的TBA-i、FFA、FR(荧光比值),POV的值都有较强的抑制作用,并呈现一定的量效关系.贮藏结束时,添加浓度为1.0% SAP与添加PG的鱼肉的PI值之间差异不显著.这表明SAP 主要通过抑制脂质氧化的初级氧化产物、二级氧化产物的生成及多烯不饱和脂肪酸的氧化降解而发挥作用.     

U-Pb Zircon and Re-Os Molybdenite Geochronology of theW-Mo Mineralized Region of South Qinling,China, andtheir Tectonic Implications

A W-Mo mineralized region is located along the northern margin of the South Qinling tectonic belt of China. WMo mineralization occurs mainly in Cambrian–Ordovician clastic and carbonate rocks, and the ore bodies are structurally controlled by NW–SE-and NNE–SSW-striking faults. Evidence for magmatism in the area is widespread and is dominated by intermediate–felsic intrusives or apophyses, such as the Dongjiangkou, Yanzhiba, Lanbandeng, and Sihaiping granitic bodies. Quartz-vein-type mineralization and fault-controlled skarn-type mineralization dominate the ore systems, with additional enrichment in residual deposits. At present, there are few or insufficient studies on(1) the age of mineralization,(2) the relationship between intermediate–felsic granite and W-Mo mineralization,(3) the source of ore-forming materials,and(4) the metallogenic and tectonic setting of the mineralized area. In this paper, we present geochronology results for numerous intrusive granitic bodies in the South Qinling tectonic belt. U-Pb zircon geochronology of the Lanbandeng monzogranite and Wangjiaping biotite monzogranite yields ages of 222.7 ± 2.3 and 201.9 ± 1.8 Ma, respectively. In contrast to the Late Triassic age of the Lanbandeng monzogranite, the age of the newly discovered Wangjiaping biotite monzogranite places it at the Triassic–Jurassic boundary. Re-Os molybdenite geochronology on the Qipangou W-Mo deposit yielded a model age of 199.7 ± 3.9 Ma, indicating the deposit formed in the early Yanshanian period of the Early Jurassic. Granitoid intrusions in the mineralized area are characterized by composite granite bodies that crystallized at ca.240–190 Ma. While there were multiple stages of intrusion, most occurred at 210–220 Ma, with waning magmatic activity at 200–190 Ma. The Re-Os age of molybdenite in the region is ca. 200–190 Ma, which may represent a newly discovered period of W-Mo metallogenesis that occurred during the final stages of magmatism. The heat associated with this magmatism drove ore formation and might have provided additional ore-forming components for metallogenesis(represented by the Wangjiaping biotite monzogranite). Ore materials in the mineralized area were derived from mixed crustal and mantle sources. Enrichment of the region occurred during intracontinental orogenesis in the late Indosinian–Yanshanian, subsequent to the main Indosinian collision. At this time, the tectonic environment was dominated by extension and strike-slip motion.