对中国大别山地区地体构造的初步探讨

本文依据大别山地区沉积特征、古生物特征、岩浆活动、变质作用及构造特征的不同,认为本区存在有各自独立的大别地体、随县-应山地体和北淮阳地体,这些地体之间以巨大的深断裂为界,它们拼贴于华北古陆和扬子古陆之间。本文初步探讨了这三个地体各自的构造演化历史,认为大别地体和随-应地体可能属外来地体,而北淮阳地体属残留地体。它们共生于于古淮阳海中。从加里东运动开始,到燕山运动为止,随着古淮阳海的消失,先后拼合、增生在一起。     

U-Pb Geochronologic, Nd Isotopic, and Geochemical Evidence for the Correlation of the Chopawamsic and Milton Terranes, Piedmont Zone, Southern Appalachian Orogen

We report U-Pb crystallization ages from four metavolcanic rocks and two granitic gneiss samples as well as whole-rock chemical analyses and Sm-Nd isotopic ratios from 25 metaigneous and metasedimentary rocks from the Chopawamsic and Milton terranes, southern Appalachian Orogen. A metarhyolite sample from the Chopawamsic Formation and a metabasalt sample from the Ta River Formation in the Chopawamsic terrane have indistinguishable U-Pb crystallization ages of 471.4+/-1.3 Ma and 470.0+1.3/-1.5 Ma, respectively. A sample from the Prospect granite that intruded metavolcanic rocks of the Ta River Formation yields a younger U-Pb date of 458.0+/-1 Ma. Metarhyolite and granitic gneiss samples from the northern part of the Milton terrane yield U-Pb dates of 458.5+3.8/-1.0 Ma and 450+/-1.8 Ma, respectively. Metavolcanic and metaplutonic rocks from both terranes span a range in major element composition from basalt to rhyolite. Trace element concentrations in these samples show enrichment in large-ion lithophile elements K, Ba, and Rb and depletion in high field strength elements Ti and Nb, similar to those from island arc volcanic rocks. Initial epsilon(Nd) values and T(DM) ages of the metaigneous and metasedimentary samples range from 0.2 to -7.2 and from 1200 to 1700 Ma for the Chopawamsic terrane and from 3.7 to -7.2 and from 850 to 1650 Ma for the Milton terrane. The crystallization ages for the metavolcanic and metaplutonic samples from both terranes indicate that Ordovician magmatism occurred in both. Similar epsilon(Nd) values from representative samples from both terranes suggest that both were generated from an isotopically similar source. Xenocrystic zircons from metavolcanic rocks in the Chopawamsic terrane have predominately Mesoproterozoic (207)Pb/(206)Pb ages (600-1300 Ma), but a single Archean (2.56 Ga) core was also present. The xenocrystic zircons and the generally negative epsilon(Nd) values indicate that both terranes are composed of isotopically evolved continental crust.     

工程高边坡稳定性评价的信息量法

通过对８种因素、７７种状态的信息量计算，得出研究区稳定性信息的权值。在取得１２８个预测单元的信息量预测值之后，划分出５３个活动单元和较活动单元，其中１２个为新预测的不稳定区。与仪器观测结果比较，一些新预测区的不稳定性得到证实。研究表明，信息量法对评价工程高边坡稳定性，特别是消除工程隐患具有重要意义。