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121.
莫里青断陷西部在始新世双阳组沉积时期发育NE,SW和NW方向三个浊积扇体,其中NE向浊积扇体仅发育于湖平面上升初期(双一段沉积时期),SW向浊积扇体在湖平面上升初期、上升早期和快速上升时期(双一,双二和双三段沉积时期)始终存在,而NW向浊积扇体形成于湖平面上升早期(双二段沉积时期),并一直持续到湖平面快速上升时期(双三段沉积时期)。目前在区内仅钻遇中扇水道、中扇过渡带和外扇沉积。 相似文献
122.
乐平煤是分布于苏浙皖赣地区龙潭组中的特有煤种(俗称树皮煤),也是一种具良好生烃潜力的烃源岩。乐平煤中,壳质组和可溶有机质含量高,母质类型为高等植物和低等生物双重来源,元素组成具富氢、低氧、高含硫的特征,应属海相成因的泥炭坪沉积。成煤物质主要来源于真蕨、种子蕨和科达类等植物的树皮体。树皮体又可分为茎皮体和根皮体两种亚组分。依据煤的显微组分组成和树皮体富集程度的不同,乐平煤可分为原地型、过渡型和微异地型三种成因类型。乐平煤的研究对整个南方二叠纪煤成烃资源的评价具重要的地质意义。 相似文献
123.
本文提出延边地层区的晚石炭世地层有两种类型:一是原地系统的天宝山组;二是外来岩块,包括原山秀岭组。并建议停止使用山秀岭组一名。 相似文献
124.
中国东北区二叠纪和早三叠世地层 总被引:4,自引:1,他引:4
本文运用裂陷槽理论,提出了早二叠世地层发育于大石寨、大河深和庙岭三个裂陷槽中。晚二叠一早三叠世则以陆相凹陷沉积为特征,发育于兴安岭、张广才岭及完这山三个凹陷内。 相似文献
125.
塔里木及邻区晚古生代早期古气候与构造 总被引:2,自引:0,他引:2
影响塔里木及邻区晚古生代早期气候的地球内部因素为古昆仑和南天山两个古洋盆封闭及有关的两条缝合构造带演化,从而形成上述时空段内热带海洋气候、热(亚热)带季风气候、热带沙漠气候以及热带滨岸干湿气候区域的更替,古气候特征的判断主要依据古地磁数据、古生态气候学、沉积环境诸方面。 相似文献
126.
127.
首次发现报道了曼信一带海相火山岩微枕状构造的地质特征。主要根据野外第一手资料,分析探讨了曼信—老厂一带火山岩的时代,主要认识是:“依柳组”火山岩的主要形成于晚二叠世;老厂地区泥盆纪—中晚石炭世有少量基性—中性火山活动及三叠纪火山活动。 相似文献
128.
H. C. Soffel S. Schmidt M. Davoudzadeh C. Rolf 《International Journal of Earth Sciences》1996,85(2):293-302
New pole positions for Triassic and Cretaceous times have been obtained from volcanic and sedimentary sequences in Central Iran. These new results confirm the general trend of the Apparent Polar Wander Path (APWP) of the Central-East-Iran microplate (CEIM) from the Triassic through the Tertiary as published by Soffel and Förster (1983, 1984). Two new palaeopoles for the Triassic of the CEIM have been obtained; limestones and tuffs from the Nakhlak region yield a mean direction of 094.0°/25.0°, N=12, k=4.1,α 95=24.7°, after bedding correction, corresponding to a palaeopole position of 310.8°E; 3.9°S, and volcanic rocks from the Sirjan regions yield a mean direction of 114.5°/35.1°, N=44, k=45.9,α 95=3.2° after bedding correction and a palaeopole position of 295.8°E; 10.3°N. Combining these with the two previously published results yields a new palaeopole position of 317.5°E; 12.7°N, for the Triassic of the CEIM, thus confirming that large counterclockwise rotations of the CEIM have occurred since the Triassic time. New results have also been obtained from Cretaceous limestones from the Saghand region of the CEIM. The mean direction of 340.7°/26.3°, N=33, k=44.3,α 95=3.8°, and the corresponding palaeopole position of 283.1°E; 64.4°N, is in agreement with previously determined Cretaceous palaeopole positions of the CEIM. Furthermore, results have also been obtained from Triassic dolomite, limestone, sandstone and siltstone from the Natanz region, which is located to the west of the CEIM. A total of 161 specimens from 44 cores taken at five sites gave a mean direction of the five sites at 033.3°/25.1°, N=5, k=69.0,α 95=9.3° and a palaeopole position of 167.2°E; 53.7°N. They pass the positive fold test of McElhinny (1964) on the level of 99% confidence. This pole position is in fairly good agreement with the mean Triassic pole position of the Turan Plate (149°E; 49°N). It indicates that the area of Natanz has not undergone the large counterclockwise rotation relative to the Turan plate since the Triassic, which has been shown for the CEIM. A Triassic palaeogeographic reconstruction of Iran, Arabia (Gondwana) and the Turan Plate (Eurasia) is also presented. 相似文献
129.
Basins within the African sector of Gondwana contain a Late Palaeozoic to Early Mesozoic Gondwana sequence unconformably
overlying Precambrian basement in the interior and mid-Palaeozoic strata along the palaeo-Pacific margin. Small sea-board
Pacific basins form an exception in having a Carboniferous to Early Permian fill overlying Devonian metasediments and intrusives.
The Late Palaeozoic geographic and tectonic changes in the region followed four well-defined consecutive events which can
also be traced outside the study area. During the Late Devonian to Early Carboniferous period (up to 330 Ma) accretion of
microplates along the Patagonian margin of Gondwana resulted in the evolution of the Pacific basins. Thermal uplift of the
Gondwana crust and extensive erosion causing a break in the stratigraphic record characterised the period between 300 and
330 Ma. At the end of this period the Gondwana Ice Sheet was well established over the uplands. The period 260–300 Ma evidenced
the release of the Gondwana heat and thermal subsidence caused widespread basin formation. Late Carboniferous transpressive
strike-slip basins (e.g. Sierra Australes/Colorado, Karoo-Falklands, Ellsworth-Central Transantarctic Mountains) in which
thick glacial deposits accumulated, formed inboard of the palaeo-Pacific margin. In the continental interior the formation
of Zambesi-type rift and extensional strike-slip basins were controlled by large mega-shear systems, whereas rare intracratonic
thermal subsidence basins formed locally. In the Late Permian the tectonic regime changed to compressional largely due to
northwest-directed subduction along the palaeo-Pacific margin. The orogenic cycle between 240 and 260 Ma resulted in the formation
of the Gondwana fold belt and overall north–south crustal shortening with strike-slip motions and regional uplift within the
interior. The Gondwana fold belt developed along a probable weak crustal zone wedged in between the cratons and an overthickened
marginal crustal belt subject to dextral transpressive motions. Associated with the orogenic cycle was the formation of mega-shear
systems one of which (Falklands-East Africa-Tethys shear) split the supercontinent in the Permo-Triassic into a West and an
East Gondwana. By a slight clockwise rotation of East Gondwana a supradetachment basin formed along the Tethyan margin and
northward displacement of Madagascar, West Falkland and the Gondwana fold belt occurred relative to a southward motion of
Africa.
Received: 2 October 1995 / Accepted: 28 May 1996 相似文献
130.
上震旦统陡山沱组是鄂西地区最具工业价值的含磷地层。著名的磷矿有荆襄磷矿、宜昌磷矿、兴(山)神(农架)保(康)磷矿。迄今已有20多年的勘探史,但由于各矿区研究程度不一,又缺古生物依据,亦不能依靠同位素年龄来作划分对比,故在地层及磷矿层的划分、对比上认识不一。笔者结合磷矿特征及含磷岩系岩类组合、剖面结构特点、稀土元素特征等,将本区划分为4个磷矿分布区,将陡山沱组划分为3个岩性段、5个含磷层位。 相似文献