大庆杏南地区葡Ⅰ组三角洲前缘储层的非均质性

当油田主力油层进入高含水期时,非主力油层接替主力油层将成为必然趋势。三角洲前缘亚相储层非均质性较强,一直以来被作为非主力油层。为提高非主力油层的储量动用程度,必须精细研究三角洲前缘亚相储层非均质性特征,查明剩余油分布规律,从而有效指导油田开发的调整挖潜。利用密井网、岩矿鉴定等资料对杏南地区葡I油层组前缘亚相储层进行研究,将三角洲前缘细分为枝状、朵状、席状3种类型,详细分析了不同沉积环境下砂体的成因类型,描述了不同类型砂体在平面上、空间上的展布特征和组合关系,不同砂体内部性质的差异以及砂体内部微观孔隙结构的类型和分布特征,从平面、层间、层内以及微观特征等方面研究了三角洲前缘储层的非均质性。在此基础上分析了储层非均质性对剩余油分布的影响,指出不同三角洲前缘储层中剩余油的富集位置。     

对北秦岭太阳寺矿集区金矿成矿特征的初步认识

甘肃省天水冯家场—两当太阳寺一带,是近年来资源评价和矿产勘查的重点,是秦岭-大别成矿省北秦岭成矿带中重要的矿化集中区。文章在分析区域构造背景的基础上,对该区成矿特征进行了初步总结,选择典型矿床进行了介绍,初次把该区命名为太阳寺矿集区,这将对该区矿产勘查工作部署,深入研究矿集区成矿规律具有参考意义。     

Geochemistry of the Mian-Lue ophiolites in the Qinling Mountains, central China: Constraints on the evolution of the Qinling orogenic belt and collision of the North and South China Cratons

The Anzishan ophiolite, a typical ophiolitic block of early Carboniferous age in the Mian-Lue suture zone of the Qinling Mountains, central China, consists of amphibolites/metabasalts, gabbros and gabbroic cumulates. All of these rocks, as well as those in the Hunshuiguan-Zhuangke (HZ) block, have compositions similar to normal MORB and back-arc basin basalts (BABB) with high ε_Nd(t) values, indicating that they were derived from a depleted mantle source. The Mian-Lue suture zone also contains blocks of other lithologies, e.g., rift volcanic rocks in the Heigouxia block and arc volcanic rocks in the Sanchazi block. Although they are in fault contact with each other, the presence of these different blocks in the Mian-Lue suture zone may represent a complete Wilson cycle, from initial rifting to open ocean basin to final subduction and continent-continent collision, during the late Paleozoic-early Triassic. In this region, the North and South China Cratons were separated by Paleo-Tethys at least until the early Carboniferous, and final amalgamation of both cratons along the Qinling orogenic belt took place in the Triassic.     

陕西小秦岭华阳川韧性剪切带的特征 及其区域构造意义

陕西小秦岭华阳川韧性剪切带发育在新太古界太华群之中,野外调研和显微构造观察结果表明,该韧性剪切带是由构造片岩、眼球状片麻岩组成的深层次韧性剪切带,具有逆冲兼左行走滑的斜冲特征。对韧性剪切带构造片岩黑云母进行^40Ar／^39Ar同位素定年,获得坪年龄为419M±0．6Ma,反等时线年龄为417Ma±0．8Ma。认为华阳川韧性剪切带及其相应的小秦岭区域主导构造变形是发生于419Ma左右的秦岭加里东事件的结果。     

东秦岭中部奥陶系-志留系界线地层及腕足动物群

东秦岭中部晚奥陶世和早志留世地层分布较广,化石较丰富,尤其是腕足类,分为寺岗组、石燕河组、刘家坡组和张湾组。曾庆銮等(1993)根据腕足类及其群落的更替,把石燕河组和刘家坡组归於早志留世,因而引起较大争论。本文据岩性将寺岗组和石燕河组分别改称为石燕河组下段和上段,并据腕足类化石认为石燕河组和刘家坡组应归於晚奥陶世、张湾组为早志留世;另据上述地层生物群落的特征及群落的更替,认为从石燕河组到刘家坡组,以及刘家坡组至张湾组恰好反映了全球冰期引起的晚奥陶世海退和早志留世冰期结束引起的海侵,故本区奥陶系-志留系界线宜划在刘家坡组和张湾组之间。     

张广才岭南部杨木岗组的厘定及物源分析

本文通过岩石组合特征和区域对比，将张广才岭南部西蛤拉河子—大锅盔一带分布的浅变质地层重新厘定为杨木岗组。为了确定杨木岗组的形成时代和沉积物源，进行了碎屑锆石U- Pb年代学和微体古生物地层学研究。锆石大多数呈自形—半自形晶，显示典型振荡岩浆生长环带，暗示其岩浆成因。该地层中测得的两组碎屑锆石U- Pb产生多组谐和年龄，其中PM010- TW样品56个测点最小峰值(谐和)年龄为307 Ma，DB02- TW样品51个测点最小峰值(谐和)年龄为275 Ma；覆盖在杨木岗组之上的中生代二浪河组安山岩的定年结果为181. 1±0. 9 Ma，表明杨木岗组形成于早二叠世晚期。杨木岗组中获取疑源类化石组合出现了新元古代晚期—早寒武世和奥陶纪地层常见分子，结合碎屑锆石年龄结果，反映杨木岗组沉积时周围存在早古生代和中—新元古代地质体。碎屑沉积岩Al2O3/TiO2平均值为24. 44，稀土元素球粒陨石标准化曲线具有轻稀土富集、重稀土稳定和负Eu异常特征，结合碎屑锆石的年龄频数可以看出，确定杨木岗组的沉积物主要来源于沉积盆地周围的晚古生代早期中酸性火成岩，次要物源由沉积盆地周边的早古生代地质体和近地表的中—新元古代地质体提供。佳木斯地块为松嫩- 张广才岭地块上晚古生代地层的形成提供了部分物源，暗示佳木斯地块与松嫩- 张广才岭地块于早二叠世之前已完成拼合。     

Geochronology of Gold Deposits and Its Implication for Metallogenesis in the Fengxian-Lixian Area, Qinling Orogenic Belt, China

Abstract: A series of super large‐scale and large‐scale Pb and Zn, and Au deposits are distributed in the Qinling orogenic belt, China. Gold deposits were generally ascribed to Carlin‐type originated from circular meteoric water. Visible and coarse‐grained gold (up to over 3mm in grain size) was recently identified in some gold deposits in the Fengxian‐Lixian area, Qinling. Au‐bearing quartz lodes related to magmatism were discovered in the Xiaogouli gold deposit. Two types of Au‐bearing quartz veins, i.e., NW‐trending quartz veins and NE‐trending quartz veins cutting strata are widely present in the Baguamiao gold deposit. Both are spatially associated with each other. The former is generally snake–like, S‐shape or zigzag, which was resulted from plastic deformation by ductile shearing, being generally cut by the latter. The latter is generally linear with widely developed bleaching alteration zones in its adjacent wall rocks, which symbolizes the superimposition of brittle deformation and filling and metasomatism of magmatic hydrothermal solution in ductile shear zones after uplifting of the shear zones near the surface. The NW‐trending quartz veins contain Au of lower than 3ppm. The NE‐trending quartz veins contain Au of more than 3 ppm, so that NE‐trending quartz veins and the adjoining altered rocks are important ores. The NW‐trending Au–bearing quartz vein was dated as 210.61.26 to 232.581.59 Ma by ⁴⁰Ar–³⁹Ar method, i.e., late Indosinian epoch (Triassic). The NE‐trending Au–bearing quartz vein was dated as 131.910.89 to 197.451.13 Ma by ⁴⁰Ar–³⁹Ar method, i.e., Yanshanian epoch (Jurassic). The ⁴⁰Ar–³⁹Ar age of the NW‐trending Au–bearing quartz veins represents the age of the ductile shear formation. The isotope data of the NE‐trending quartz veins indicate that gold mineralization was closely related to Indosinian and Yanshanian granite intrusives not only in time and space, but also in origin.     

南北带北段磁性构造特征和地震活动的关系

利用航磁资料研究了南北带北段的磁属性构造，反演了该区居里等温面的埋藏深度，推断了不同深度断裂的分布情况，进南昌讨论了地震与深部背景的关系。     

辽南滨海黄土粒度环境信息高分辨率研究

对辽南滨海黄土粒度研究证明 ,滨海黄土是在第四纪冰期寒冷气候下的产物 ,但是 ,由于滨海黄土所处靠近沿海的地理位置使得这种黄土的形成机制具有独特性。冰期时渤海湾西岸海面下降出露的冲洪积物和海底砂是滨海黄土除西北内陆地区以外的另一重要物源 ,搬运以风砂跃移方式进行。滨海黄土的粒度中包涵了丰富的有关渤海湾海面变化的信息。辽南滨海黄土剖面中的粒度拟合值、 2 - 3Ф粒级百分含量反映了渤海的海退、海侵过程和末次冰期蒙古高压的强弱 ,这种变化与滨海黄土 3个孢粉组合带所反映的古气候环境相吻合 ,同邻近地区的海面升降变化和深海岩芯氧同位素阶段也存在良好的对应关系 ,滨海黄土粒度的拟合度是本区古环境变化的重要的替代指标。     

华南地区凉果加工业与凉果资源的匹配关系分析——以广东省新兴县为例

文章以广东省新兴县为例，从凉果资源分布与加工能力的匹配关系角度对华南地区凉果资源的分布，凉果加工业的分布与布局，凉果市场分布与竞争力，凉果加工业与资源的匹配关系等进行了分析，并针对华南地区凉果加工业面临的主要问题提供了一些建议。