The relationship between the earthquakes of Ningbo area and the Neotectonic movement

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The Discovery of a Crinoid Community in the LateTriassic Zhuganpo Formation of Guizhou Provinceand Its Geological Significance

Recently a rich and well-preserved crinoid community including Traumatocrinus and Encrinus has been found in the Late Triassic Zhuganpo Formation in Guanling and Xingyi, Guizhou province, China. Among the fossils Traumatocrinus is the richest, and most of it occurs as clusters, with each cluster containing 3-42 crinoid branches. Study of the stem and calyx of Traumatocrinus shows that the number of stem-joints (columnals) is equal to the total stem length × K (5.85 per cmx stem-diameter). There are about 376 first- and second-order columnals on the whole stem. This number seems to coincide with the number of days in a year at that time. According to the present study of the palaeoecological environment of the crinoid community, it is considered that the reproduction and preservation of the crinoid community were controlled by the Late Triassic regression and the restricted bay of an interior sea behind the S-shaped shoal zone.     

Distribution Patterns of Pentacyclic TriterpenoidHydrocarbons in Low-Mature Source Rocksfrom Eastern China

Four typical distribution patterns of pentacyclic triterpenoid hydrocarbons (types A-D) are distinguished in the low-mature source rocks from eastern China. Type A has a relatively high content of pentacyclic triterpenes. It exists in immature sediments and the distribution and abundance of triterpenes vary with the maturity of the sediments. An unknown C30 triterpene (UCT2) has also been detected in very shallow sediments. This compound is very unstable and disappears rapidly with the increase of depth. Type B is characterized by a relatively high amount of 17α(H), 21β(H)-30-homohopane. This kind of distribution pattern is common in coals and terrestrial sediments of low maturity. Type C has a relatively high content of diahopane and neohopane series. The analysis shows that this distribution pattern may have an indirect relationship with the input of higher plants despite its microbial source. There are C30-unconfirmed triterpane (UCT2) and a relatively high content of C35 hopane in type D. The dist     

淮南煤矿塌陷区煤矸石填充复垦及其对环境的影响

在分析淮南矿区煤矸石和地面塌陷现状的基础上,探讨用煤矸石填充塌陷区的意义及其对环境的影响。     

徐州市大气环境质量演化规律分析

通过几年来对徐州市大气中二氧化硫,氮氧化物,总悬浮微粒,降尘,硫酸盐化速率等几种主要污染物演化规律的分析,阐述本区大气污染物的来源,并对大气环境质量作出初步评价,论证本区大气环境污染特征及演化趋势,为今后大气环境质量管理提供科学依据。     

南京栖霞山地质环境的开发和保护

地质环境是自然环境的一部分,是人类赖以生存的客观地质实体。地质环境的开发利用,保护与改造,在现实生活中往往是比较突出的矛盾。著名的佛教胜地,风景旅游区和重要的多金属矿产基地的南京栖霞山,在这方面就存在许多问题。对之应采取护岸工程,治水,治支,治坡,保护和改造地质环境,限制地下水的开采量,保持地下水资源的供需平衡等措施,是根治栖霞山地质环境问题的基本对策。     

南京玄武湖水底交通隧道工程与环境效应分析

南京玄武湖隧道,既在城市中心,又在水下,是脆弱环境下典型的地质工程。影响水下隧道施工的不权有环境工程地质条件,还有城市环境约束因素;另外,隧道施工会对城市环境产生不良影响。作者对上述问题作了具体分析,并用系统工程的思想对隧道出口及施工方案的选择进行了初步评价。     

云贵高原湖泊沉积物碳酸盐和有机质的同位素组成及环境信息记录

云贵高原湖泊沉积物碳酸盐和有机质的同位素组成及环境信息记录＠肖保华￥中国科学院地球化学研究所高原湖泊,碳酸盐,有机质,碳同位素,地球化学记录,环境气候信息云贵高原湖泊沉积物碳酸盐和有机质的同位素组成及环境信息记录肖保华（中国科学院地球化学研究所,贵阳５５０...     

西藏江孜地区上白垩统宗卓组沉积混杂堆积基本特征及构造意义

分布于藏南江孜一带的上白垩统宗卓组沉积混杂堆积岩呈近东西向与雅鲁藏布江缝合带平行相伴,由“基质”、原地岩块、外来岩块三部分组成。“基质”以正常沉积的细碎屑岩为主;原地岩块是沉积物未完全固结时,由于重力或其它地质作用使之变形变位后形成的;外来岩块成分复杂、形态各异、大小悬殊,不同岩块中产晚三叠世—早白垩世的箭石、双壳类等化石。岩块间很少直接接触,地貌上明显突起,其变形变质程度与“基质”极不协调,它是早白垩世以来,喜马拉雅板片向冈底斯－念青唐古拉板片俯冲,于被动陆缘形成近东西向的狭长海槽,而仰冲板片受到强烈的破碎,大小不等的岩块滑落于海槽中构成的沉积混杂堆积岩。