福建建宁均口地区早白垩世火山地质特征

建宁均口地区早白垩世火山岩可划分为２个组４个段，火山岩双峰式组合特征明显，火山岩相特征及空间分布特征显著，区内发现７个火山机构和２个寄生火山，安远－都畲线状火山群由５个受裂隙控制的中心式火山机构所组成，是寻找金矿和非金属矿的有利部位，火山活动的构造环境为拉张环境；岩浆来源可能源于地壳和上地幔。     

五台山康家沟金矿成矿地质特征

五台绿岩带柏枝岩组火山喷气岩由基－中酸性火山岩及其凝灰岩和含电气石，金云母的石英大理岩组成，其中赋存有金矿床。康家沟金矿区已发现金矿体８个，呈透镜状，长５０－２００ｍ，厚０．２８－４．４ｍ，延深１０－２００ｍ。矿石类型可分为赤铁矿－石英型和碳酸盐两种。／     

1：20万德化,福清幅区域重力异常的研究

本文主要依据１：２０万德化、福清幅重力场特征，结果合其它区域物探及地质、区域化探、遥感资料、把本区构造单元划分为３个Ⅰ级构造单元，３个Ⅱ级构造单元；推断解释环状构造两个，断裂构造带３３条，其中深断裂带５条，大断裂带９条，一般断裂带１９条；圈定隐伏、半隐伏酸性一超基性岩体３８个，半隐伏地层５处，推断火山构造一个，把测区火岩基底划分为三大区，将Ⅱ区又进一步划分为３个次级区；圈定成矿远景 预测区５个；通     

白银厂铜多金属矿床——壳幔交代中的地幔流体成矿探讨

依据深部构造、火山岩建造与基性和钙碱性、中酸性、酸性火山岩的双峰式火山作用，确定白银厂矿田、矿床形成于切割硅铝层的古裂谷构造环境。其中小铁山、铜厂沟等矿床和折腰山、火焰山矿床两次成矿事件与双峰式火山活动同时发生，成矿作用与酸性火山岩具有时空上的一致性。矿石中CO2流体包裹体除H2O含量高外，与上地幔CO2流体包裹体成分一致；矿石富含大离子亲石元素和具富Mg、K的成矿蚀变元素组合，硫和铅来自下地壳或上地幔。喷气硅质岩锶同位素初始值表明，矿质来源于不均一地幔，S/Se、Co/Ni、Se/Te值亦指示矿质来源于深部。 本文提出矿床形成于强烈扩张的裂谷期，断裂的延深生长使地幔深部产生去挥发作用，释放大量CO2和含金属元素的地幔流体与上地幔基性岩浆向地壳侵入，导致下地壳熔融，形成酸性岩浆。与酸性岩浆喷发的同时，富含挥发份和金属元素的高盐度热卤水，沿断裂上升流入海底沉积成矿。     

VOLCANIC ACTIVITY IN TAIWAN

I.MesozoicEraVolcanicAchvityDlepre-Tertlalyl11etal11olphicbase111entisOnlyexposedalongtheeastemflankoftheBackboneRangeoftl1eCentraIRangeinTaiwan(Figurel).Overlpngthebasen1e11t,tl1estratumofTertiarytoQuaten1alysysten11sexposed(Flgure2).Deposltlonofthepre-TertlaryrocksprobablybopninPen1llanperiodandextendedintoMesozoic.Theserockswerelatertectonizedandlnotal1lorPhosedinlateMesozoictil11earldtl1el11aJororogenic111ovelnentisnamedYenshanlllovelnent(t1ieNanaoorogenylnTaiwan).A:lthe111eta11…     

Chemical and isotopic signatures of the basement rocks from the Campi Flegrei geothermal field (Naples, southern Italy): inferences about the origin and evolution of its hydrothermal fluids

The Campi Flegrei (Naples, Campanian Plain, southern Italy) geothermal system is hosted by Quaternary volcanic rocks erupted before, during and after the formation of the caldera that represents one of the major structural features in the Neapolitan area. The volcanic products rest on a Mesozoic carbonate basement, cropping out north, east and south of the area. Chemical (major, minor and trace elements) and stable isotope (C, H, O) analyses were conducted on drill-core samples recovered from geothermal wells MF-1, MF-5, SV-1 and SV-3, at depths of ˜ 1100 to 2900 m. The study was complemented by petrographic and SEM examination of thin sections. The water which feeds the system is both marine and meteoric in origin. Mineral zonation typical of a high-temperature geothermal system exists in all the geothermal wells; measured temperatures in wells are as high as ˜ 400 °C. The chemical composition of the waters suggests the existence of two reservoirs: a shallow reservoir (depth < 2000 m) fed by seawater that boiled at 320 °C and became progressively diluted by steam-heated local meteoric water during its ascent; and a deeper reservoir (depth > 2000 m) of hypersaline water. The drill-cores are mainly hydrothermally altered volcanics of trachy-latitic affinity, but some altered pelites and limestones are also present. Published Na, Mg and K concentrations of selected geothermal waters indicate that the hydrothermal fluids are in equilibrium with their host rocks, with respect to K-feldspar, albite, sericite and chlorite. The measured δ¹⁸O_(SMOW) values of rocks range from +4.3 to + 16.5%. The measured δD_(SMOW) values range from − 79 to − 46%. The calculated isotopic composition of the fluids at equilibrium with the samples vary from + 1 to + 8.3%. δ¹⁸O and from − 52 to + 1%. δD. The estimated isotopic composition of the waters at equilibrium with the studied samples confirmed the existence of two distinct fluid types circulating in the geothermal system. The shallower has a marine water signature, while the deeper water has a signature consistent both with magmatic and meteoric origins. In the latter case, the recharge of this aquifer likely occurs at the outcrop of the Mesozoic Limestones surrounding the Campanian Plain; after infiltration, the water percolates through evaporitic layers, becoming hypersaline and D-depleted.     

火山震动特征及其动力学研究进展

结合国内外资料，介绍了近年来火山震动的非线性动力学研究进展，并且讨论了预测火山活动的某些综合方法。     

中国东北地区新生代火山幕

中国东北地区分布着约690个火山锥和火山口,50000km~2的玄武岩和粗面岩。自白垩纪晚期到现代可分为10个火山幕,即大屯幕(86—61Ma)、双辽幕(49—39Ma)、下辽河幕(37—27Ma)、甑峰山幕(23—19Ma)、奶头山幕(16—13Ma)、老爷岭幕(11—7Ma)、军舰山幕(4.5—2.0Ma)、龙岗幕(1.5—0.8Ma),白头山幕(0.58—0.06Ma)和五大连池幕(近10000年以来)。火山活动的高潮在中新世和第四纪。早期火山活动发生在松辽地堑内部,随着时间的推移,火山活动逐渐向两侧呈递叠式发展,在大陆边缘一例表现尤为明显。