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Evidences for the existence of ferromanganese crust boundary were found for the first time during the survey of the “DA YANG YI HAO” Vessel 2003. Some typical characteristics of the boundary are summarized and the significances of the finding of the boundary are included in the genesis discussion. Ore prospecting and assessment of the crust resources are described in this paper. The morphologic and extending characteristics of the crust boundary led to the recognition of two types of crust boundary： interpenetration crust boundary and closed crust boundary. According to the distribution and types of the crust, however, the boundaries are classified into three types： the boundary between ferromanganese crust and detrital sediment, the boundary between tabular crust and seamount nodules, and the boundary between tabular crust and rudaceous crust. This study revealed that the boundary between tabular crust and nodules was not formed under different regional environments but formed under different nucleation potential barriers between different initial growth （nucleation and germination） processes and between solid rocks and loose sediments. The rudaceous crusts are controlled spatially by fracture zones and the crusts＇ boundaries are controlled by the seamount structure and landform. The discovery of the crust boundaries reveals the crust＇s ‘negative growth’ phenomena （especially for some seamount nodules）. The boundary investigation can be helpful in identifying the existence of tabular crust covered by detrital sediments and in calculating the area covered by the crust. The resource calculation error and the resource quality as well as resource exploration degree can be assessed through the survey of crust boundary. 相似文献
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通过对黄骅坳陷港西断裂带奥陶系灰岩和新近系沙河街组砂岩中11个钻井的岩心包裹体的特征，均一温度和组分等方面的分析，对其所反映的气体来源，形成环境，油气演化以及地质意义进行研究。研究区的包裹体均为次生成因包裹体，气液比在5％～10％之间，根据激光拉曼光谱技术分析组分主要为H2O，CO4和CH4。利用均一温度，结合古地温和埋藏史，发现奥陶系灰岩和新近系沙河街组砂岩中包裹体中流体均捕获于新近纪。对氦同位素的分析发现包裹体中均有幔源氦的侵入．侵入的份额受到NE向港西断层和NWW向徐庄子断层的控制靠近断裂带的灰岩和砂岩中的包裹体含有还原性气体，由断层交汇中心向四周减少。包裹体中烷烃气的成熟度也与断层活动相关，具有从断层交汇中心向四周减小的相似特征。研究区内港西断层和徐庄子断层交汇处不仅是幔源气体上涌的有利通道，也是地热活动强烈的地区，有利于烷烃气的成熟。 相似文献
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