爆裂法作为快速测定流体包裹体中二氧化碳（和其它气体）含量的手段及其在勘探中的使用：以中国山东和河北省金矿为例   总被引：1，自引：0，他引：1  

Kingsley Burlinson 《岩石学报》2007,23(1):65-71

The acoustic decrepitation method heats a small monomineralic sample and counts pressure impulses as the inclusions burst when they develop high internal pressures.For aqueous fluids,the decrepitation temperature is correlated with the homogenisation temperature,but gas rich fluids give a distinct and characteristic low temperature decrepitation peak which can be used to recognize gas rich fluid inclusions.This information is useful in exploration for Au deposits,which are frequently associated with CO_2 rich and sometimes CH_4 rich fluids. This distinctive decrepitation occurs because the CO_2 rich inclusion fluids expand according to the gas law and develop internal pressures high enough to burst the host mineral grain at temperatures well below their homogenisation temperatures.In contrast,aqueous fluids condense to a liquid and vapour phase during post-entrapment cooling.Upon subsequent heating their internal pressures do not increase significantly until after homogenisation to a single phase occurs and hence they do not decrepitate"prematurely"as gas rich inclusions do. This behaviour is usually regarded as an annoyance in conventional microthermometric homogenisation studies,but can readily be used as an exploration aid to find mineralisation deposited from such gas rich fluids.Decrepitation results on samples from Cowra Ck, NSW,Australia,which have also been microthermometrically measured for CO_2 content,show that amounts of less than 5 mole % CO_2 are easily distinguished by decrepitation and amounts as low as 1 mole % CO_2 may be determinable. Examples of the use of acoustic decrepitation in the study of 6 gold mines in the Shandong and Hebei provinces of China are discussed.  相似文献   

A comparison of acute and chronic toxicity tests used to examine the temporal stability of a gradient in copper tolerance of Hediste diversicolor from the Fal estuary, Cornwall, UK     

Burlinson FC  Lawrence AJ 《Marine pollution bulletin》2007,54(1):66-71

The aim of this study was to use two different toxicity tests to verify the existence of a gradient in tolerance along Rostronguet Creek. Hediste diversicolor was collected from five populations in the Fal estuary previously shown to vary in copper tolerance. Exposure to 4 mgL(-1) of copper in an acute assay demonstrated that Mylor Creek worms were sensitive (LT(50) 86 h) and the tolerance of Rostronguet Creek worms increased moving upstream from the mouth of the creek (LT(50)s 100-258 h). There was no significant difference in tolerance between Mylor worms and worms from the mouth of Rostronguet Creek. This is in agreement with a previous study [Grant, A., Hateley, J.G., Jones, N.V., 1989. Mapping the ecological impact of heavy metals on the estuarine polychaete Nereis diversicolor using inherited metal tolerance. Marine Pollution Bulletin 20, 235-238] and demonstrates temporal stability of the gradient. Copper tolerance was also measured using a chronic toxicity test run for 90 d using step-wise increases in challenge concentration. A significant difference in tolerance was shown between populations from Mylor Creek and those at the mouth of Rostronguet Creek, which has not been reported previously. Experimental protocol was therefore an important factor in detecting population variation in tolerance.  相似文献   

松辽盆地徐家围子营城组流纹岩地球化学特征及构造指示意义   总被引：13，自引：3，他引：10  

孟凡超  刘嘉麒  李明  刘晓  印长海  陆加敏  崔岩 《岩石学报》2010,26(1):227-241

松辽盆地徐家围子营城组发育一套以流纹岩为主的中酸性火山岩。岩石薄片观察和主量、微量元素研究发现,后期热液蚀变、区域埋深及低温水合作用对流纹岩的Si、K、Rb等元素含量产生一定影响; 流纹岩明显富集Rb、Th、U、Pb等强不相容元素,Ba、Sr、Ti、Eu、P 负异常,暗示其经历了斜长石、磷灰石和钛铁矿分离结晶作用。流纹岩的(⁸⁷Sr/⁸⁶Sr)_i(0.705265 ~ 0.711895)值变化范围较大,大多数ε_Nd(t)为正值(1.83 ~ 3.38),Pb同位素比值相对集中,(²⁰⁶Pb/²⁰⁴Pb)_i=18.09～18.32,(²⁰⁷Pb/²⁰⁴Pb)_i=15.50 ~ 15.54,(²⁰⁸Pb/²⁰⁴Pb)_i=37.80 ~ 38.10。研究表明,岩石的源区为大比例年轻成分与少量古老地壳的混合部分熔融,其演化过程中经历了不同程度的地壳混染。松辽盆地早白垩世火山岩为板内伸展环境喷发的产物,可能与太平洋板块俯冲导致的中国东部岩石圈减薄、软流圈上涌密切相关。  相似文献   

The use of fluid inclusion decrepitometry to distinguish mineralized and barren quartz veins in the aberfoyle tin-tungsten mine area, Tasmania     

K. Burlinson  J.C. Dubessy  G. Hladky  R.W.T. Wilkins 《Journal of Geochemical Exploration》1983,19(1-3)

In the Aberfoyle Sn/W district of N.E. Tasmania, mineralization is in quartz veins associated with Devonian granite. The host rocks to the mineralization are folded Silurian quartzites, greywackes and shales and these also contain abundant pre-mineralization quartz veins which can be difficult to distinguish from irregularly mineralized ore veins on geological criteria, especially in drill core. It was found that the decrepitation characteristics of the quartz, chiefly the intensity ratio of high and low temperature peaks, which are developed in all decrepigrams, enable a distinction between the two generations of veins to be readily made. The differences between the fluid inclusions in the two generations of veins are relatively subtle, however it seems clear that “CO₂-rich” inclusions having a wide range of composition and density are the main source of decrepitation events and that the major differences in decrepitation behaviour can be correlated with differences in average homogenization temperature of these inclusions. Even those ore veins which have undergone moderate ductile deformation have the typical signature of their origin. The decrepitation results are supported by analyses of inclusion gases by Raman microprobe. These analyses differentiate a third group of veins which are possibly unmineralized veins belonging to a separate hydrothermal system.  相似文献