Erratum     

《Geodinamica Acta》2013,26(6):391-393

The Monts de Lacaune belong to the south-eastern (external) part of the French Massif Central. They constitute the lowermost unit in the Albigeois Nappe Pile, which is juxtaposed to the S against the gneiss dome (“Zone Axiale”) of the Montagne Noire. The Monts de Lacaune are composed of Cambrian to Silurian sediments, which show very low-grade metamorphic conditions. A multi-method investigation of phyllosilicates (illite and chlorite crystallinity, b cell dimension, K-Ar dating of fine fractions and electron microprobe analysis) permits to distinguish three metamorphic events: M1 (acquired during early folding and nappe stacking, 342-333 Ma), M2 (caused by the rise of the hot Zone Axiale) and M3 (probably caused by post-Variscan intrusions, Permian). The age range obtained for the nappe stacking is intermediate between deformation ages dated in the northern part of the Albigeois Nappe Pile and in the Southern Palaeozoic Nappes (southern Montagne Noire). This conforms to the classical concept of S-ward propagating tectonic accretion in the French Massif Central with a rate of shortening of c. 1.5 cm/year.  相似文献   

Anchimetamorphism of the Neoproterozoic and the Lower Paleozoic along the Profile of Yuanguping in Western Hunan Province, China   总被引：3，自引：0，他引：3  

WANG Hejing  CHEN Tao  WANG Huan  ZHANG Zuqing"Orogene  Crust Evolution " Key Laboratory of the Ministry of Education of Chin  School of Earth  Space Sciences  Peking University  Beijing 《《地质学报》英文版》2004,78(1):170-176

The Neoproterozoic and Lower Paleozoic along the profile of Yuanguping in western Hunan Province, China underwent anchimetamorphism. The illite crystallinity (IC) of the <2 μm fractions ranges from 0.23-0.34°△2θfor the Neoproterozoic to 0.23-0.35°△A2θ for the Lower Paleozoic (calibrated with the Kisch IC set, Kisch, 1991). This indicates that the metamorphic grade of the Neoproterozoic and Lower Paleozoic is the anchizone. The peak metamorphic temperature is estimated to be 290-210℃. This result does not agree with the greenschist or subgreenschist facies of the Banxi Group, nor with the lower-greenschist facies or sedimentary cover of the Sinian to Lower Paleozoic, as most previous researchers thought. The illite (K-mica) b0 values range from 0.9074 to 0.8963 (nm) for the Neoproterozoic and the Lower Paleozoic. Based on cumulative frequency curves of the illite (K-mica) b0, the peak metamorphic pressure of the Banxi Group was derived to be of a type that is slightly higher than that of the N. Ne  相似文献   

粘土矿物地温计在沉积盆地热演化研究中的应用     

王丹萍  杨风丽  江裕标  包汉勇 《四川地质学报》2010,30(3):351-355

在成岩过程中形成的粘土矿物真实地记录了地层形成的成岩温度及其盆地热演化的信息,可以作为沉积盆地的热史指标。本文主要介绍了伊利石/蒙皂石间层矿物（以下简称伊/蒙间层或I/S间层）、伊利石结晶度、绿泥石化学成分三种常用的粘土矿物地温计的发展历史、基本原理和影响因素;回顾了我国沉积盆地热演化研究中粘土矿物地温计的应用现状,并对未来的应用推广工作提出了若干参考建议。  相似文献   

应用国际标样对伊利石结晶度测定值的校正及其意义   总被引：1，自引：0，他引：1  

游建昌  毕先梅  侯纯敏 《现代地质》2008,22(1):53-59

伊利石的结晶度(IC),又称Kbler指数(K.I.),是指粘土矿物伊利石10×10-8cmXRD峰的半高宽。作为一个变质程度的指标,结晶度广泛用于研究高级成岩—极低级变质—低级变质作用的演变过程,随着变质程度的提高,伊利石结晶度逐渐增大。根据Kbler的建议,近变质带(极低级变质带)上、下边界的伊利石结晶度分别为0.42(°Δ2θ)和0.25(°Δ2θ)。然而,测定伊利石结晶度时,由于缺少国际标样,且各实验室间的样品制备、仪器条件、测试方法也不相同,因而导致获得的数据有较大差别,缺少可比性;因此,使用国际标样对数据进行校正,使各实验室获得的数据都能直接地进行对比,是非常必要的。利用X射线衍射方法测定了由L.N.Warr提供的5个伊利石结晶度的国际标样(其中,4个为岩石碎屑样品,采自英格兰西南部的极低级变质带;1个为单矿物样品,采自印度的花岗岩),获得了校正方程,ICCIS=0.977IC测定值+0.0336(°Δ2θ),R2=0.9835。在实验室内对213件采自国内的样品进行测定,测试条件与国际标样的测试条件相同,利用此方程对测得的伊利石结晶度数值进行校正,证实本实验室对伊利石结晶度的测定具有较高的可信度和国际可比性。  相似文献   

Metamorphism of Triassic Flysch Along Profile Zoigê-Lushan, Northwest Sichuan, China     

WANG Hejing  M. RAHN  TAO Xiaofeng  ZHENG Nan  XU Tingjing 《《地质学报》英文版》2008,82(4)

We used illite and chlorite crystallinities, index minerals, mineral assemblages, polytype and domain size of white mica, electron microprobe analysis (EMPA), b0 geobarometer and chlorite geothermometer to quantify the diagenetic and metamorphic overprint on the Triassic flysch formations in the Songpan-Garzê orogen along profile Zoigê-Lushan, northwest Sichuan. Two anchizones, two epizones, one diagenetic zone and a transition belt in-between them are defined on the basis of the obtained data. lllite crystallinity correlates strongly with the best mean domain size of mica and moderately with chlorite crystallinity. 2M1 white mica polytype are observed within the epizone whilst 2M1 and 1M polytypes occur in the anchizone and diagenetic zone. Epizonal metamorphism reached maximum temperatures of 370℃±21℃ at low-to intermediate pressure conditions. Clay minerals underwent Ostwaid ripening during metamorphism. Rocks from both sides of the Longmenshan fault reveal contrasting degrees of metamorphic overprint: on the northwest side of the Longmenshan fault, epimetamorphlc conditions contrast with diagenetic rocks on the southeast side.  相似文献   

自生伊利石40Ar-39Ar法年代学实验过程中一些重要环节的探讨     

刘大永  彭平安  潘长春  王龙樟 《矿物岩石地球化学通报》2008,27(2)

自生伊利石^40Ar-^39Ar年代学在油气勘探及其他领域具有重要意义,但由于自生伊利石晶体结构的特殊性,使这一方法从样品处理到数据解释都有一些需要探讨的问题。自生伊利石提纯方法主要由冷冻-加热碎样结合高速离心完成。样品粒度愈细,样品纯度愈大,结晶度愈差。通过X射线衍射可以获得样品纯度、结晶度方面的信息,用TEM可以获得XRD检测限（5％）以下的样品纯度信息。样品^39Ar核反冲丢失与样品中晶体的结晶度（2θ）、晶体沿c轴方向的层厚相关;真空包裹技术可以较合理地降低核反冲丢失,得到细粒样品有意义的年龄。真空包裹的细粒样品的“保留年龄”有重要的地质意义。  相似文献   

粉煤灰-伊利石/PAA-AM高吸水复合材料的吸液性与释钾性能研究     

沈上越  范力仁  凌辉  陆丽辉 《矿物岩石》2007,27(3):6-11

粉煤灰疏松多孔,具有一定的吸水能力,对土壤有很好的改良作用;伊利石属层状粘土矿物,具有吸水性,含钾较高,可以提高土壤肥效。采用溶液聚合法首次合成了粉煤灰-伊利石/PAA-AM高吸水复合材料,其吸蒸馏水、自来水、生理盐水倍率分别为1695、445、106倍,吸液性能达到和超过了国家"863"项目技术指标和国家农业部的要求。此吸水材料成本低,有利于改良土壤与改善土壤的缺钾状况。同时,还通过谱学分析(原子吸收、X衍射和红外光谱),较深入地研究了该复合材料的释钾机理。  相似文献   

Electron Diffraction Patterns of Plesiotwinning of Fe-lllite     

CHEN Tao  CHEN Daizhang  WANG Hejin 《《地质学报》英文版》2005,79(3):332-335

Abstract  A new selected area electron diffraction (SAED) pattern was found from Fe‐illite. The lattice of the ED pattern can be described as a compound tessellation of (3,6)[79{3,6}], which is based on a large coincidence‐site lattice (CSL) with oriented crystal associations rotated by a non‐crystallographic angle 26°. This phenomenon corresponds to the plesiotwinning of Fe‐illite and has been never reported in the nature so far.  相似文献   

哈得逊油田成藏研究   总被引：14，自引：0，他引：14  

米敬奎  张水昌  涂建琪  李新虎 《地球化学》2006,35(4):405-412

对哈得逊油田的原油成分、原油和储层沥青族组分碳同位素、储层自生伊利石年龄和包裹体研究,以及该地区沉积和构造历史的研究表明,哈得逊油田发生过两次油气充注,第一次油气充注发生在晚二叠纪,早期原油在油田范围内只是经过,并没有聚集成藏。由于当时储层埋藏较浅,储层成岩作用弱,没有包裹体的形成。晚海西期由于构造抬升,储层中残留的早期原油发生了降解,只保留了一些重质组分。目前油藏中保存下来的原油为喜马拉雅期注入的、由O2 O3源岩形成的原油。  相似文献   

伊利石结晶度Kbler,Weaver和Weber指数关系式常数的确定与应用     

王河锦  陶晓风  Rahn Meinert 《高校地质学报》2007,(3)

根据衍射峰具有的不同分布特点推导出了14个伊利石结晶度Kbler指数,Weaver指数和Weber指数关系式中常数项C1-C14的数值,提出了PearsonVII分布中形态参数μ与C5,C6,C11,C12的4个定量方程。由此,14个伊利石结晶度指数关系式可直接用于实际计算。根据阿尔卑斯复理石伊利石形态特征Sc=0.731,由这些关系式进行近变质带上下界线的转换得出与Kbler指数0.42～0.25。△2θ界线对应的Weaver指数和Weber指数的界线值分别为5.8～17.6和300～179。讨论了在自然干燥状态下直接进行伊蒙混层鉴定的基本原理。  相似文献