共查询到20条相似文献，搜索用时 125 毫秒
1.
依据不同构造岩浆区单元，江西中南部中新元古代－晚三叠世的侵入岩可划分为武夷山构造岩浆区、赣西南构造岩浆区。其中武夷山构造岩浆区共划分了43个单元，归并为11个超单元；赣西南构造岩浆区共划分为34个单元，归并为10个超单元。这样较系统地建立了江西省中南部中新元古代－晚三叠世岩石谱系单位和等级体制，为今后开展全省侵入岩谱系单位划分奠定了基础。 相似文献
2.
Numerous systems of land classification have been proposed. Most have led directly to or have been driven by an author's philosophy of earth-forming processes. However, the practical need of classifying land for planning and management purposes requires that a system lead to predictions of the results of management activities.We propose a landscape classification system composed of 11 units, from realm (a continental mass) to feature (a splash impression). The classification concerns physical aspects rather than economic or social factors; and aims to merge land inventory with dynamic processes.Landscape units are organized using a hierarchical system so that information may be assembled and communicated at different levels of scale and abstraction. Our classification uses a geomorphic systems approach that emphasizes the geologic-geomorphic attributes of the units.Realm, major division, province, and section are formulated by subdividing large units into smaller ones. For the larger units we have followed Fenneman's delineations, which are well established in the North American literature. Areas and districts are aggregated into regions and regions into sections. Units smaller than areas have, in practice, been subdivided into zones and smaller units if required.We developed the theoretical framework embodied in this classification from practical applications aimed at land use planning and land management in Maryland (eastern Piedmont Province near Baltimore) and Utah (eastern Uinta Mountains). 相似文献
3.
A stratigraphic section may be divided into lithologic units which in turn may be divided into beds. This paper gives a mathematical
formulation of stratigraphic sections that takes these two levels into account and uses bed properties to yield the thickness
and number of beds in lithologic units. The model is a semiMarkov chain in which the succession of lithologic bed types forms
a Markov chain and is an independent random variable. The model is tested against stratigraphic data obtained from micrologs.
There is close agreement between the observed and calculated thicknesses of lithologic units. Tests for the degree of agreement
between observed and calculated numbers of beds in lithologic units are hampered by inability to observe thin beds on micrologs.
Some implications of this limitation to stratigraphic analysis are noted. 相似文献
4.
福建省地层多重划分,对比研究（续） 总被引：1，自引：0，他引：1
福建省地层多重划分、对比研究（续）李兼海，王国平，郑铁藩，梁诗经（福建省区域地质调查队，三明，３６５００１）３晚三叠世一新第三纪印支运动后，福建地壳发生了重大变革，全境由海转变成陆地。晚三叠世一中佛罗世，除闽西南局部地区有海湾泻湖相沉积外，皆为河流一... 相似文献
5.
流动单元划分新方案及其在临南油田的应用 总被引：2，自引：1，他引：1
把沉积学与储层物性相结合, 从流动单元体系的角度出发, 提出了流动单元划分的新方案.在流动单元体系内部划分出流动单元、亚流动单元和渗流区3个不同层次.在储层精细小层对比的基础上, 首先根据区域内连续分布的隔层把储层分成几个独立的流体压力系统, 即流动单元; 然后再根据不连续分布的隔层, 把一个流动单元进一步分成若干个亚流动单元; 最后根据储层物性的差别把流动单元/亚流动单元划分成不同的渗流区.按照这个思路, 选取临南油田的典型高产区块———以三角洲前缘亚相沉积为主的夏52块砂三中段三砂组, 进行了流动单元、亚流动单元和渗流区的划分, 共划分出7个流动单元、7个亚流动单元和63个渗流区, 这样划分出来的流动单元体系同时包括了油藏整体与局部细节的特征, 为油藏开发提供了详细的地质依据, 也在实际应用中取得了良好的效果. 相似文献
6.
7.
以重要的宝石级红珊瑚品种Corallium elatius为研究对象,采用偏光显微镜、扫描电子显微镜、透射电子显微镜等测试手段,逐级还原了Corallium elatius样品从宏观到纳米的多级结构构建：有缺陷但具有一定定向性的纳米筹组成了亚微米单元;亚微米单元按一定方向排列形成了骨针单元;骨针单元的组合形成了片状单元;定向性近乎一致的片状单元沿界线（有机质）排列成了明暗相间的人字纹单元;人字纹单元以髓部为中心依次排列形成了Corallium elatius样品横截面的放射状纹理。每一级结构由更小尺度的结构单元组成,同时,多个同尺度单元又排列形成上一级结构。在这种多级嵌套结构中,每一级的结构单元具有几乎一致的定向性。随着结构单元尺度的细化,结构单元的定向程度降低。从生物矿物学角度探讨了不同尺度方解石模块的自组装模式,揭示了样品在有机质调控下的特殊结构,为后续的研究提供了方向。 相似文献
8.
永泰序列系复式深成岩体，由4个深成岩体、48个侵入体组成。按岩石谱系单位可划分为3个单元、2个独立单元及若干个亚单元。其形成时代为早白垩世，属同熔型花岗岩类。岩体受北北西向及北东东向断裂控制，为拉张环境下被动就位。 相似文献
9.
用于油藏描述的三维地质体剖分及体积计算方法 总被引：3，自引：0，他引：3
针对计算机模拟中的关键问题，即三维地质体的剖分和体积计算方法进行了较深入的讨论。在将地质体剖分为内部单元和边缘单元之后，又将内部单元细分为中间的长方柱体和两端的不规则多面体。通过分析，给出了计算内部单元和边缘单元不规则多面体的体积计算公式，并通过对两种理论模型的剖分和计算结果，说明了方法的正确性和提高精度的有效性 相似文献
10.
11.
12.
大别山东段的变质地层格架 总被引：5，自引：0，他引：5
上世纪80年代末以后完成的大别山区1∶5万区域地质调查,将大别山的中深变质杂岩解体为变质变形侵入岩和变质表壳岩两部分,但所建立的构造岩石/地层单位大多沿用了1∶20万区域地质调查的地层名称。与之同期,大别山超高压变质岩发现以来的地质研究也揭示出大别山中深变质岩的主体为正片麻岩,并以变质特征及其构造属性划分出4个构造单元。本文依据前人的地质调查和研究成果,将大别山的变质地层划分为4个岩石地层(构造岩石地层、构造岩石)单位,3个非正式岩石地层单位。论述了它们与区域地质调查所划分的地层单位的对比,以及与4个构造单元的对应关系。 相似文献
13.
Tectonic Units and Their Fundamental Characteristics on the Northern Margin of the Alxa Block 总被引：6，自引：0，他引：6
Wu Tairan Geology Department China University of Geosciences Beijing He Guoqi Geology Department Peking University Jiang Minxi 《《地质学报》英文版》1993,67(4)
The northern margin of the Alxa block is the junction of a tectonic units. Four first-order tectonic units are distinguished: 1. the Yagan structural zone characteristic of an immature island arc; 2. the Zhusileng-Hangwula structural zone, which was a passive continental margin in the Early Palaeozoic and was transformed into an active continental margin in the Late Palaeozoic;3. the Shalazha structural zone characteristic of a mature island arc; 4. the Nuru-Langshan structural zone, which was a Proterozoic orogenic belt and later evolved into an extensional transtional crust in the Palaeozoic. The above-mentioned tectonic units differ remarkably in sedimentary formations, magmatic rock associations, metamorphism and geochemistry and are bounded by faults between one another. 相似文献
14.
15.
Abstract The northern margin of the Alxa block is the junction of a tectonic units. Four first—order tectonic units are distinguished: 1. the Yagan structural zone characteristic of an immature island arc; 2. the Zhusileng—Hangwula structural zone, which was a passive continental margin in the Early Palaeozoic and was transformed into an active continental margin in the Late Palaeozoic; 3. the Shalazha structural zone characteristic of a mature island arc; 4. the Nuru—Langshan structural zone, which was a Proterozoic orogenic belt and later evolved into an extensional transitional crust in the Palaeozoic. The above—mentioned tectonic units differ remarkably in sedimentary formations, magmatic rock associations, metamorphism and geochemistry and are bounded by faults between one another. 相似文献
16.
大别山南坡蕲春等地榴辉岩的发现及相关问题 总被引：1，自引：0，他引：1
20世纪90年代早、中期，一些研究者根据榴辉岩的出露情况，将大别山腹地的大别杂岩出露区划分为“北大别地体”、“UHP地体”和“宿松地体”3个不同性质的大地构造单元，其中“北大别地体”和“宿松地体”2个地体被视为不含榴辉岩的构造单元。然而，自90年代后期以来，在“北大别地体”中陆续发现了大量的榴辉岩露头。近期笔者在“宿松地体”中也首次发现了榴辉岩露头。上述事实表明前人仅仅根据榴辉岩的出露将大别杂岩划分为3个构造单元的认识是不妥的，大别杂岩应该为一个具有一定成因联系的构造-岩石单元，属于同一个大地构造单元。 相似文献
17.
18.
新建9个正式岩石地层单位、4个非正式地层单位;将上三叠统日干配错群解体为6个岩石地层单元;解体中上侏罗统雁石坪群;将色哇组分为三段;将班公湖怒江带木嘎岗日群解体为4个岩石地层单元;在西藏首次发现(上三叠统姜钟组)纳拉菁耳羽叶;在羌塘盆地首次发现(下—中侏罗统色哇组)辐鳍鱼类化石;新建8个侵入岩填图单位,时代为晚侏罗世—新近纪末期;在班 怒结合带塔仁本一带首次发现了洋岛型玄武岩;新发现了一系列新生代岩浆岩;在班怒带及南羌塘盆地中发现一些呈串珠状分布的小型斑岩体;发现班 怒带上时代最新的枕状玄武岩。 相似文献
19.
为探索适合中—高山区的土壤地质调查方法,选择兼具高寒山区、干热峡谷和中山宽谷盆地等不同地貌单元,以及沉积建造、岩浆建造和变质建造等不同地质建造类型的大凉山区西昌市进行试点研究。本次工作基于地质建造,将西昌市成土母质划分为7大类14个类,土壤地质单元分为31个类,并探讨了他们的互馈机制。研究认为,地质建造是土壤的物质基础,大体控制了土壤的平面分带,而海拔等地理因素则控制土壤的垂向分带。本项研究可为地方政府的规划布局提供数据支持和科学依据,也为高山区的土壤地质调查和生态地质调查提供了思路与范例。 相似文献
20.
Petrographic variations within thick turbidite sequences: an example from the late Palaeozoic of eastern Australia 总被引：2，自引：0，他引：2
R. J. KORSCH 《Sedimentology》1978,25(2):247-265
The subdivision of thick sequences of turbidite sediments has been problematical because of the monotonous nature of the units. One method, of using detailed detrital petrography for a large number of specimens, has delineated variations with a sequence of Late Palaeozoic age in eastern Australia. The rocks occur within a single structural block and are all members of one sedimentary petrographic province. They have been subdivided into three stratigraphic units (Moombil Beds, Brooklana Beds and Coramba Beds) and greywackes from these units are quartz-poor to quartz-intermediate, feldspathic or volcanolithic types. Dacitic volcanism has provided most of the detritus and the contribution from non-volcanic sources is small. The Coramba Beds are further subdivided into four petrographic units which are parallel to the stratigraphic boundaries. These lithostratigraphic units are based on the presence or absence of detrital hornblende, and the relative ratio of volcanic lithic fragments to feldspar. Vertical petrographic variations within the entire sequence indicate that although the acid volcanic source was predominant throughout the time of deposition, there is a noticeable increase in the contribution from intermediate-volcanic, acid-plutonic, low-grade metamorphic and sedimentary sources towards the top of the sequence. Detrital hornblende is also present in the upper parts of the sequence. 相似文献