南黄海沉积速率和沉积通量的初步研究

1983—1986年,中美联合对南黄海进行了调查,利用同位素~(210)Pb方法测定了该海域的沉积速率和沉积通量,分别介于0.026—0.67cm/a和0.033—0.76g/(cm~2·a)之间。研究表明,山东半岛南侧是现代黄河物质大量沉积的场所,而在黄海暖流流经的地带和冷涡区,其沉积作用却较弱;物质来源和海流体系是控制该海域沉积速率和通量的主导因素。     

《东特提斯地质构造形成演化》:书评

《东特提斯地质构造形成演化》:书评@B.C.伯奇菲尔$美国科学院!院士、美国地质学会主席、中国科学院外籍院士     

Estrogen receptor (ER) agonists and androgen receptor (AR) antagonists in effluents from Norwegian North Sea oil production platforms

The in vitro estrogen receptor (ER) agonist and androgen receptor (AR) antagonist potencies of offshore produced water effluents collected from the Norwegian Sector were determined using recombinant yeast estrogen and androgen screens. Solid phase extraction (SPE) concentrates of the effluents showed E2 agonist activities similar to those previously reported for the United Kingdom (UK) Continental Shelf (<0.1-4 ng E2 L(-1)). No activity was detected in the filtered oil droplets suggesting that produced water ER activity is primarily associated with the dissolved phase. Targeted analysis for methyl- to nonyl-substituted alkylphenol isomers show the occurrence of known ER agonists in the analysed samples. For the first time, AR antagonists were detected in both the dissolved and oil associated phase at concentrations of between 20 and 8000 microg of flutamide equivalents L(-1). The identity of the AR antagonists is unknown, however this represents a significant input into the marine environment of unknown compounds that exert a known biological effect. It is recommended that further analysis using techniques such as bioassay-directed analysis is performed to identify the compounds/groups of compounds that are responsible in order to improve the assessment of the risk posed by produced water discharges to the marine environment.     

对J C Savage关于“沿圣安德烈斯断层蠕变部分的无震滑动和垂直断层应变”所作评论的回复

太平洋板块与希拉内华达大峡谷微板块间的相对运动大多数是通过沿圣安德烈斯断层的走向滑动来调整的。在圣安德烈斯断层中部（CSAF）,沿走向的滑动近于以无震断层蠕变的形式发生（Thatcher,1979;Titus等,2006;Rolandone等,2008;Ryder and Burgmann,2008）。     

Tectonomagmatic origin of some volcanic and sub-volcanic rocks from the Lower Benue rift,Nigeria

Petrological and geochemical studies on some volcanic and sub-volcanic rocks from the Lower Benue rift indicate that they are basalts, basaltic and doleritic sills, trachybasalt and trachyte which generally belong to the alkali basalt series. The alkaline affinity is clearly evident in both their normative and modal mineral compositions, as well as their chemical compositions. The generally high fractionation indices [(La/Yb)N] are 7.06 to 17.65 for the basaltic rocks and 23.59 to 135. 35 for the trachytic rocks, against low values commonly seen in subalkaline (tholeiitic) series, with strong enrichments in the incompatible elements. All this strongly supports their alkaline affinity. The basaltic rocks are generally fine-grained and porphyritic, consisting of phenocrysts of clinopyroxene and olivine in the groundmass of the same minerals together with plagioclase. The clinopyroxene is either diopside or clinoenstatite. The trachyte consists of oligoclase, orthoclase, biotite, quartz and exhibits typical trachytic, flow structure. The basaltic and doleritic sills are commonly altered, with calcite and epidote as common alteration prod-ucts. This alteration, which is reflected in the erratic behaviour of K2O, MnO and P2O5 on Harker variation diagrams, high values of LOI, strong depletions in the more mobile LILE (Rb, K, Ba and Sr) and high Th/Ta ratios, is attributed to the effects of an aqueous fluid phase and crustal contamination. On the whole, the mineralogical, as well as major-, trace-elements and REE data suggest that the rocks are co-genetic and most likely derived from differentiation of an alkali olivine-basalt magma, generating through variable low degrees of partial melting of probably an enriched lithospheric (upper) mantle following an asthenospheric uplift (mantle plume or intumescence) with HIMU signa-tures in a within-plate continental rift tectonic setting. This corroborates earlier results obtained for the intrusive rocks in the region.     

COMPUTER DEMODULATION TECHNIQUE FOR A DUAL-CHANNEL MICROWAVE RADIOMETER

The three stairstep output of the video amplifier has now been designed for the NOAA/WPL dual-channel radiometer in order to provide an analog input to one A/D converter instead of to two phase-detectors, and the synchronous detection for data and AGC is done in software. We put the new system into the dual-channel radiometer which was set in Boulder Atmospheric Observatory (BAO) to make experiments for three weeks and found the processor reliable and flexible.     

The Origin of the Luipo Iron Ore in Western Szechuan

正 Ⅰ. INTRODUCTION Close to the grand canyon of the Chingshakiang near Luipo~1 in western Szechuan (Plate I, Fig. 1), there occurs a more or less.flat-topped mountain, which, stretching from the city of Luipo northeastward to Wenshuicheng~2, is     

On the Type Species of Chusenella

正 DIAGNOSIS: Test fusiform, slightly rounded at the ends; about 11.2 mm. long, 3.7 mm. wide, giving an axial ratio of about 1:3; whorl 9 to 10, the first three or four volutions closely coiled thence gradually evolute; spiral wall increases in thickness as the test grows, being 0.016 mm. in the firs     

On two New Fossil Fishes from Southwestern China

Among many other important discoveries of vertebrate palacontology made inthe past few years,a few remains of fish afford special interest.In W Kunming,Yunnan,remains of Hybodus were found which represent the second knownshark in China.In Weiyuan,Szechuan,a dental plate of Ceratodus has beendiscovered,which is so far the only record of this interesting fish in China.Both are described in the following lines.     

On the Occurrence of Gigantopteris-Flora in Kwangsi

The geological and geographical distribution of the genus Gigantopteriswas first summarized by Yabe in 1917. Fourteen years later Yoh published alist of 20 localities distributed in different provinces in China known at that timenamely Hunan, Shansi, Liaoning, Kiangsi, Fukien, Chekiang, Anhui, Yunnan