Ultrahigh-pressure (4.5–5.5 GPa) experimental research on pyroxene-garnet transition and its significance

Conclusions The transition from natural Al-enstatite to garnet and Al-poor pyroxene has taken place under the condition of about 1000°C and 4.5–5.5 GPa, and new phases of garnet and corundum have formed when 15% Al₂O₃ was added to the initial natural Al-enstatite. This experimental result has explained the ultrahigh pressure (3.5–5.0 GPa) and relatively low temperature (< 1000°C) genesis of the ultramafic rock of high-pressure metamorphic zone in Dabieshan-northern Jiangsu-Jiaodong and of red corundum garnetite coexisting with garnet peridotite. From the genetic mineralogy, petrology andP-T equilibrium conditions of garnet peridotite of the high-pressure metamorphic zone, kimberlite and Cenozoic basalt and the ultrahigh pressure experimental result, it is inferred that the upper mantle garnet peridotite is transformed with the increase of depth from Al-rich pyroxene garnet peridotite (80–120 km) to Al-poor pyroxene garnet peridotite (greater than 120–150 km).     

目标层次建模预测水下扇储层微相分布

储层目标层次随机建模方法(Fluvsim)是一种新的基于目标的储层随机建模方法.与传统的随机建模很少考虑储层成因联系相比,储层目标层次随机建模方法较好地考虑了储层成因联系,通过储层目标整体生成,再现成因上相关储层在空间分布特征.而模拟退火方法的引入,克服了基于目标方法难以忠实于条件数据的缺点.利用Fluvsim较好地建立了濮城油田C中期旋回水下扇微相空间分布.沟道垂向比例在模拟实现中得到很好的再现,误差不超过3%.抽稀检验表明,沟道吻合程度参数平均值超过80%,建模结果具有较高的可信度.     

含油气盆地反转构造研究综述

反转构造是当前世界石油地质界研究的热门课题之一 ,是指在地史发展过程中 ,不同时期各种构造作用在一个地质体上的联合、叠加的构造面貌 ,有正反转构造和负反转构造 2种基本类型 .近十多年来许多石油地质学家从几何学、运动学及成因机制等角度对其进行了广泛研究 ,在识别、分类、成因机制及与油气运聚关系方面取得了一系列的进展 ,但仍有许多问题期待解决 .下一步研究的主要内容和发展方向为 :1反转构造的分类问题 ;2负反转构造及其与油气的关系问题 ;3反转构造在造山带、盆山耦合研究中的应用问题 .4反转构造的定量研究及成因机制问题     

Th-rich zircon from peralka line A-type granite： Mineralogical features and petrological implications

Zircon is one of the most common accessory minerals in igneous rocks, especially in granites. It exists through the crystallization and evolution of grantic magma be-cause of stable physicochemical properties. Trace element abundances (e.g. Hf, Th, U, Y) in zircon are very sensitive to the crystallization environments[1]. Therefore, zircon plays an important role in the granite research. However, although A-type granites are given more and more regards by the geologists owing to their charac…     

论贵东花岗岩体的成因及其起源

本文根据贵东花岗岩体在地质学、岩石学、岩石化学、地球化学和稀土元素配分等方面的特征,探讨了它的成因和起源。结果表明,贵东岩体系由陆壳硅铝层重熔而形成,且受重熔的地层,很可能就是该区域晚元古代一早古产代的加里东地槽型沉积物。     

Stratification of metamorphic belts and its genesis in the Liaohe Group

Stratification of metamorphic belt in the Liaohe Group during M2 episode of the Lüliang metamorphic period is proposed. Its genesis is elucidated to be caused by bedding-parallel sliding, magma layered-intrussion and burial depth.     

长江渝宜河段深槽分布特征及成因

长江重庆－宜昌河段深槽分布密集、形态各异，既不同于一般河谷的深槽跌水，也有别于平原区河床的边潍、深槽的孪生形成；该段河道远离海洋，不受海平面变动的影响，更不同于下游河段的深槽成因，根据1：12000长江重庆－宜晶段航道图，1：200000三峡库区地质构造图及1：500000库区地形图量算统计、拟合、分析，本段河床深槽相对分布位置基本上可归为6种类型：峡谷段深槽、河宽缩窄段深槽、支流入口处深槽、弯道凹岸深槽、弯道凸岸深槽及串珠状河段原槽潭，其成因是在特定地质构造、岩性组成的背景基础上，主要由水动力波动、束流、环流、泡水作用所致。     

Magnetic mineralogy of the Hongqiling Cu-Ni sulphide deposit: Implications for ore genesis

Pyrrhotite is one of the common ore minerals in Cu-Ni sulphide deposits, but only monoclinic pyrrhotite is ferromagnetic at room temperature. X-ray and EPA analyses reveal that most pyrrhotite forming sideronitic texture in the Hongqiling Cu-Ni sulphide deposit is monoclinic, but that in the massive ore is a mixture of monoclinic and hexagonal pyrrhotites. Differential thermal and magnetic- thermogravimetric analyses of massive ore indicate a magnetic transition and heat absorption at 323℃, suggesting that this temperature is the thermomagnetic and phase transition point of pyrrhotite. For massive pyrrhotite ores heated at 400oC for 30 h and then quenched by cool water, the monoclinic pyrrhotite (mpo) transforms completely into the hexagonal pyrrhotite (hpo). However, all the pyrrhotites resulting from slow cooling of the sample in air are mpo. These results indicate that transformation between hpo and mpo depends upon the cooling rate. Therefore, massive ores in this deposit might have been formed via rapid cooling of ore melts. On the other hand, it is significant to study the effect of the ratio of the magnetite in total ores on the genesis of magmatic Cu-Ni suphide deposits.     

论巴赫金对话理论与道家创生观对于现代生态危机的启示

阐述了巴赫金对话理论对于现代生态危机的启示，介绍了中国道家哲学与西方现代性反思的对话。比较了西方基督教的“创造观”与中国道家的“创生观”。     

石墨矿床中产出的天然纳米碳管

纳米碳管因其特有的性质已成为一种引人注目的材料。本文报道了产于新疆苏吉泉石墨矿床中的天然纳米碳管，并对其进行了高分辨电子显微镜研究。该发现表明迄今为止所有碳的同素异形体均可产于自然界，并且高温、压力、催化剂颗粒在产生纳米碳管的过程中起到了非常重要的作用。计算了石墨化花岗岩的形成温度和压力等条件。该发现对指导科学家合成纳米碳管和利用该矿床具有十分重要的意义。