河南灵宝小秦岭金矿带矿化特征及富集规律研究

本文简述了河南灵宝小秦岭金矿带矿化特征，提出了全区金矿化富集的层位性、分带性、主从性、方向性及似等距性，同时探讨了工业矿脉内金矿化的若干局部富集规律。     

蜕壳促长素对斑节对虾、刀额新对虾蜕壳和生长的作用

在对虾人工配合饲料中添加蜕（脱）壳促长素，喂养斑节对虾（ＰｅｎａｅｕｓｍｏｎｏｄｏｎＦａｂｒｉｃｉｕｓ）和刀额新对虾（ＭｅｔａｐｅｎａｅｕｓｅｎｓｉｓＤｅＨａａｎ），观察其促进蜕壳、生长的作用。试验证明：饲料中添加不同浓度（０．５‰。、１．０‰、１．５‰）的蜕壳促长素，均不同程度地促进对虾的蜕壳和生长。添加浓度为１．５％。效果最为明显。值得在生产中应用。     

Discovery of the Avon – Solent Fracture Zone and its relationship to Bath hot springs

 The hot springs of Bristol and Bath and two geothermal wells at Southampton are located on a 155-km-long Avon–Solent Fracture Zone extending in a NW–SE direction from the Severn Estuary to the English Channel. Initiated during the Variscan earth movements and reactivated in Miocene times, the structure, which extends across the English Channel to France, is still active. With this discovery, it should now be possible to throw fresh light on the origin and movement of the thermal water at Bath and thus to protect the hot springs from derogation by limestone quarrying. Received: 16 October 1995 · Accepted: 13 February 1996     

南海东北部磁静区深部构造及成因模式

2001年7-8月,国家重点基础研究发展规划项目（973）的二级课题《中国边缘海前新生代基底特征及其构造格局》与两岸合作课题《南海东北部与台湾间的构造及地球物理研究》合作在南海东北部地区开展了重、磁、震资料的海上采集航次,获取了大量珍贵数据,其中973NH-01与MLTW测线垂直穿越了南海东北部传统意义上的磁静区。以这两条测线的重磁资料为主,结合地震解释剖面,对磁静区的重磁异常特征、重磁基底及深部构造进行了深入的分析和研究,并结合前人工作对磁静区的成因模式提出了新的解释,认为磁静区位于南海北部被动大陆边缘的洋陆交界带（COB）,独特的动力构造背景导致其下伏的地幔高热物质上涌并沿构造薄弱带侵入成岩墙,进而造成区域居里面抬升,磁性层减薄,磁异常减弱而形成磁静区。     

Regression and Time Series Analysis of the World Oil Peak of Production: Another Look

This paper analyzes world oil production data as a population/resource growth model. Both US and world oil production data are analyzed in terms of the logistic growth curve. It is shown that the logistic growth curve, while a suitable model for the American data, is not a suitable model for world oil production. A flexible family of curves which allows a wide range growth rates is considered. Using a nonlinear regression, one can predict various peak dates and total recoverable resources using different curves which all fit the data indistinguishably well.     

Interaction of Freshly Precipitated Silica Gel with Aqueous Silicic Acid Solutions under Ambient and Near Neutral pH-conditions: A Detailed Analysis of Linear Rate Law

Interaction of freshly precipitated silica gel with aqueous solutions was studied at laboratory batch experiments under ambient and near neutral pH-conditions. The overall process showed excellent reversibility: gel growth could be considered as an opposite process to dissolution and a linear rate law could be applied to experimental data. Depending on the used rate law form, the resulting rate constants were sensitive to errors in parameters/variables such as gel surface area, equilibrium constants, Si-fluxes, and reaction quotients. The application of an Integrated Exponential Model appeared to be the best approach for dissolution data evaluation. It yielded the rate constants k _dissol ∼ (4.50 ± 0.68) × 10⁻¹² and k _growth ∼ (2.58 ± 0.39) × 10⁻⁹ mol m⁻² s⁻¹ for zero ionic strength. In contrast, a Differential Model gave best results for growth data modeling. It yielded the rate constants k _dissol ∼ (1.14 ± 0.44) × 10⁻¹¹ and k _growth ∼ (6.08 ± 2.37) × 10⁻⁹ mol m⁻² s⁻¹ for higher ionic strength (I ∼ 0.04 to 0.11 mol L⁻¹). The found silica gel solubility at zero ionic strength was somewhat lower than the generally accepted value. Based on the and standard Gibbs free energy of silica gel formation was calculated as and −850,318 ± 20 J mol⁻¹, respectively. Activation energies for silica gel dissolution and growth were determined as and respectively. An universal value for growth of any silica polymorph, is not consistent with the value for silica gel growth, which questions the hypothesis about one unique activated complex controlling the silica polymorph growth.     

High-pressure and ultrahigh-temperature metamorphism at Komateri, northern Madurai Block, southern India

We report for the first time the evidence for prograde high-pressure (HP) metamorphism preceding a peak ultrahigh-temperature (UHT) event in the northernmost part of the Madurai Block in southern India. Mg–Al-rich Grt–Ged rocks from Komateri in Karur district contain poikiloblastic garnet with numerous multi-phase inclusions. Although most of the inclusion assemblages are composed of gedrite, quartz, and secondary biotite, rare staurolite + sapphirine and spinel + quartz are also present. The X_Mg (=Mg/[Fe+Mg]) of staurolite (0.45–0.49) is almost consistent with that reported previously from Namakkal district in the Palghat–Cauvery Shear Zone system (X_Mg = 0.51–0.52), north of the Madurai Block. The HP event was followed by peak UHT metamorphism at T = 880–1040 °C and P = 9.8–12.5 kbar as indicated by thermobarometric computations in the Grt–Ged rock and associated mafic granulite. Symplectic intergrowth of spinel (X_Mg = 0.50–0.59, ZnO < 1.7 wt.%) and quartz, a diagnostic indicator of UHT metamorphism, probably formed by decompression at UHT conditions. The rocks subsequently underwent retrograde metamorphism at T = 720–760 °C and P = 4.2–5.1 kbar. The P–T conditions and clockwise exhumation trajectory of the Komateri rocks, comparable to similar features recorded from the Palghat–Cauvery Shear Zone system, suggest that the Madurai Block and the Palghat–Cauvery Shear Zone system underwent similar HP and UHT metamorphic history probably related to the continent–continent collision during the final stage of amalgamation of Gondwana supercontinent.     

Tectono-metamorphic evolution of the Neyriz metamorphic complex, Quri-Kor-e-Sefid area (Sanandaj-Sirjan Zone, SW Iran)

The Neyriz region includes outcrops of metamorphic rocks that are thrust over the Neotethyan ophiolites. These rocks are affected by a major deformational event, the result of which includes a shearing polyphase foliation present in gneissic core domes, overprinted by a crenulation cleavage. These fundamental structures developed contemporaneously with a medium-pressure metamorphism which is characterized by the syn-kinematic crystallization of kyanite and the beginning of anatexis, followed by the development of retrometamorphic mineral parageneses. The major deformation phase in the area occurred during the Early-Cimmerian orogeny in the Late Triassic. Following the orogeny, the gneiss domes started to rise into the upper levels of the crust. From the geodynamic point of view, after the Mid-Permian the studied area was situated at southern passive margin of the Iranian plate; the central Iranian microcontinent at that time was separated by the Neotethys ocean from the Gondwanian supercontinent. After the Late Triassic the region became an active margin associated with an accretionary prism. The margin was finally involved in an orogenic wedge after the closure of the Neotethyan oceanic basin in the Late Mesozoic. Closure of the basin resulted in a major thrusting of the metamorphic rocks of the southern Iranian margin over the Neotethyan ophiolites.     

Demise of the northern Tethyan Urgonian carbonate platform and subsequent transition towards pelagic conditions: The sedimentary record of the Col de la Plaine Morte area, central Switzerland

The sedimentary succession of the Col de la Plaine Morte area (Helvetic Alps, central Switzerland) documents the disappearance of the northern Tethyan Urgonian platform in unprecedented detail and suggests stepwise platform demise, with each drowning phase documented by erosion and phosphogenesis. The first identified drowning phase terminated Urgonian carbonate production in a predominantly photozoan mode. Using a correlation of the whole-rock δ¹³C record with the well-dated record from SE France, its age is inferred to as Middle Early Aptian (near the boundary between the weissi and deshayesi zones). A subsequent drowning phase is dated by ammonites and by a correlation of the whole-rock δ¹³C record as Late Early Aptian (late deshayesi to early furcata zone). A third drowning phase provides an ammonite-based age of Early Late Aptian (subnodosocostatum and melchioris zones) and is part of a widely recognized phase of sediment condensation and phosphogenesis, which is dated as latest Early to Middle Late Aptian (late furcata zone to near the boundary of the melchioris and nolani zones). The fourth and final drowning phase started in the latest Aptian (jacobi zone) as is also indicated by ammonite findings at the Col de la Plaine Morte. The phases of renewed platform-carbonate production intervening between the drowning phases were all in a heterozoan mode.

During the ultimate drowning phase, phosphogenesis continued until the Early Middle Albian, whereas condensation processes lasted until the Middle Turonian. Coverage of the external margin of the drowned Urgonian platform by a drape of pelagic carbonates started only in the Late Turonian. During the Santonian, the external part of the drowned platform underwent normal faulting and saw the re-exposure of already lithified Urgonian carbonates at the seafloor.

Based on the here-inferred ages, the first drowning phase just precedes oceanic anoxic episode 1a (OAE 1a or “selli event”) in time, and the second drowning phase partly overlaps with OAE 1a. The onset of the third drowning event slightly predates two further periods of increased organic-matter accumulation in the Vocontian Basin (Noir and Fallot levels), and the onset of the fourth and final drowning phase may coincide with two further periods of increased organic-matter accumulation in the Vocontian Basin (Jacob and Kilian levels, part of OAE 1b). These correlations indicate a relationship between the so-called anoxic episodes and the stepwise demise of the Urgonian platform, even if the onset of environmental change is registered earlier on the platform than in basinal sediments.     

湖北随南荞麦冲含金剪切带变形特征及成矿机制初探

养麦冲金矿位于湖北随州南东秦岭造山带南缘。该区剪切带较发育，剪切带走向２９０°－３２０°，倾向南西，长５０ｋｍ，宽１００－１５００ｍ，并具有Ｓ－Ｃ组构，ａ型褶皱，剪切褶皱糜棱岩，型构造等。据构造特征可确定两种剪切带类型：１．早期韧性剪切带，该类剪切带为ＮＷ向，为右行运动，表现为顺层剪切，常出现于先存构造面或岩系与岩性界面附近。这类剪切带常为多层次韧性滑脱面。２．中、晚期韧一脆性和脆性剪切带。这类剪切带以线性剪切形式产出，ＮＷ向，斜冲性质，属左行运动样式。金矿床伴有Ａｓ、Ｈｇ异常，与剪切带有明显关系。成矿作用是从韧脆性阶段至脆性阶段。