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1.
Classopollis花粉及其古气候意义 总被引：4，自引：0，他引：4
以黄陇煤田焦坪矿区侏罗纪煤层中抱粉组合为例,探讨了Classopollis花粉及其母体植物所代表的古气候。指出产生Classopollis的植物的古生态环境是多样的,至少部分生长在潮湿的、适于成煤的气候条件下。 相似文献
2.
滇西耿马四排山地区地质新认识 总被引：5，自引：3，他引：5
滇西耿马四排山地区弄巴组（原南皮可组上部）盛产化石抱粉，通过５０多块样品的分析，获得了晚泥盆世末（Ｒｅｔｉｓｐｏｒａｌｅｐｉｄｏｐｈｙｔａ）叶至早石炭世早期（Ｇｒａｎｄｉｓｐｏｒａｓｐｉｃｕｌｉｆｅｒａ）孢粉组合。它们可以与西欧同期孢粉进行对比，并能部分地与澳大利亚同期孢粉对比。因原南皮河组岩性复杂，已经被刘本培等（１９９３）改为南皮河群。本文对原南皮河组上部地层进行了研究并命名为弄巴组，其时代为晚泥盆世末至早石炭世。通过抱粉相分析和野外沉积标志的观察以及对孢粉比较学的研究，从而获得了对该套地层沉积相和植物古地理方面的新认识。 相似文献
3.
对窑街朱儿庄红层的孢粉和地层层序及时代进行了系统分析与对比研究。在朱儿庄红层剖面中划分出３个孢粉组合:①枫香粉属－楝粉属组合，时代为早－中始新世；②柳粉属－朴粉属－粉属组合，属始新世中、晚期；③栎粉属－柳粉属－粉属组合，属晚始新世－早渐新世。研究表明:窑街地区朱儿庄红层始新世孢粉组合与中国东、西部地区孢粉组合相似，均发育以亚热带和暖温带植物为主的亚热带型落叶阔叶林，气候炎热；始新世晚期至早渐新世则演变为以暖温带落叶阔叶树种为主的针阔叶混交林植被，气候温暖湿润。 相似文献
4.
新疆于田普鲁地区中侏罗世地层的发现及其孢粉组合面貌 总被引：1，自引：2，他引：1
根据在新疆于田县普鲁地区新发现的中侏罗世地层及抱粉组合面貌的分析对比，参照其它动物及轮藻化石等，该套地层的时代应为中侏罗世早期，层位与杨叶组相当。结合本区侏罗纪地层层序、岩性及岩相变化、接触关系等，探讨了杨叶期的古地理环境，于田及其周缘地区为杨叶期沉降中心所在，策勒至民丰之间可能是今后找油的有利区段。 相似文献
5.
滇西北丽江盆地的第四纪地层与古环境 总被引：5，自引：1，他引：5
通过野外观测和室内分析，根据新发现的哺乳动物化石材料与抱粉分析资料，对滇西北丽江盆地的第四系进行了较详细的划分，拟定了其地质时代，讨论了其沉积相与形成时期的古环境。 相似文献
6.
广西宁明盆地第三纪孢粉植物群及其地层意义 总被引：5，自引：0，他引：5
对宁明县城西北南宁至凭祥公路旁第三纪邕宁群露头剖面进行孢粉研究 ,所揭示的孢粉组合中 ,被子植物花粉以壳斗科、桦木科、金缕梅科、榆科和胡桃科为主 ,并零星分布草本植物花粉 ,包括蓼科的蓼粉属、毛茛科的毛茛粉属和菊科的刺面三孔沟粉属等分子 ;裸子植物花粉以松科为主 ,杉科其次 ,松科主要是双束松粉属和单束松粉属 ,雪松粉属连续分布 ,云杉粉属在剖面的中下部连续出现、上部消失 ,铁杉粉属和油杉粉属少量断续分布 ,还见有罗汉松科罗汉松粉属的连续少量分布 ,以及个别的麻黄科麻黄粉属分子 ;蕨类植物孢子零星。对区内地层与孢粉资料作综合对比 ,认为本孢粉组合所指示的地层时代为渐新世。因宁明盆地邕宁群底部以往的孢粉资料反映晚始新世特征 ,推测该盆地第三纪地层的时代至少为晚始新世—渐新世。 相似文献
7.
伊宁盆地三叠系的岩性、沉积相和孢粉组合特征与准噶尔、吐鲁番和塔里木北缘基本一致。下三叠统上仓房沟群为冲积扇—河流相紫红、灰紫色砂砾岩、泥岩夹砂岩，厚３４０～４７４ｍ；中三叠统克拉玛依组为河流—湖泊相粉砂质泥岩与砂岩旋回沉积，厚５８～１２１ｍ；上三叠统黄山街组和郝家沟组由湖泊相的深灰—黑色泥岩与粉、细砂岩组成，厚１４０～２６３ｍ。 相似文献
8.
本文报导了贵州金沙中侏罗统下沙溪庙组顶部以Alisporites（阿里粉属）、Piceites（云杉粉属）为主的花粉孢子组合,计花粉10属15种、孢子2个属种,多数气囊发育,在风动力和水动力作用下,以其特有的丰度和特征组合埋藏在中侏世远岸深湖的沉积物中,其上覆的上沙溪庙组底部则发育以Cyathidites（桫椤孢属）为主的孢子花粉组合,大致与侏罗系南方区的第二个组合相当（即可与Cyathidites-Callialasporites-Neoraistrickia组合相对比,时代归属为中侏罗世。 相似文献
9.
甘肃窑街寺湾沟－炭洞沟红层孢粉组合、地质时代与生态环境 总被引：2，自引：0，他引：2
对窑街寺湾沟－炭洞沟红层孢粉和地层层序及时代进行了系统分析与对比研究。在该剖面中划分出２个孢粉组合：①双束松粉属－无口器粉属－杉粉属－栎粉属－瘤面海金砂孢属组合，时代为早渐新世；②双束松粉属－拟桦粉属－栎粉属－藜粉属－瘤面海金沙孢属组合，属中渐新世。研究表明：窑街寺湾沟－炭洞沟红层剖面的层位位于朱儿庄剖面之上，整个窑街地区的红层剖面属始新统－中渐新统；窑街地区始新世孢粉组合与中国东、西部地区孢粉组合相似，均发育以亚热带和暖温带植物为主的亚热带型落叶阔叶林，气候炎热；始新世晚期至早渐新世则演变为以暖温带落叶阔叶树种为主的针阔叶混交林植被，气候温暖湿润；中渐新世为暖温带落叶阔叶林，气候较温暖湿润。区域对比分析表明，从渐新世早期中国东、西部植被开始出现差异并逐渐加大，该时期也许是中国新构造运动的一个重要时期。 相似文献
10.
唐古拉山地区广泛出露早新生代陆相红层, 确定这些红层的时代对认识青藏高原的形成具有非常重要的意义.沱沱河组上部的孢粉化石组合以被子植物花粉为主, 且主要为三沟和三孔沟类, 包括栎粉属 (尤其是小栎粉和小亨氏栎粉) 、楝粉属、坡氏粉属和三孔沟粉属等, 具孔类花粉很少, 大部分属种为古近纪常见分子;组合中出现少量鸡爪勒粉属、唇形三沟粉属、山萝卜粉属、管花菊粉属等草本植物花粉;并含有零星古老类型的成分, 如克拉梭粉属、五边粉属和江汉粉属;裸子植物花粉含量低, 蕨类植物孢子零星.基于孢粉组合特征分析, 认为沱沱河组上部的地质时代为始新世中晚期, 为进一步完善了该区新生代地层系统提供了新的依据. 相似文献
11.
Annette E. Götz Joachim Szulc Susanne Feist-Burkhardt 《International Journal of Earth Sciences》2005,94(2):267-274
The stratigraphic distribution of sedimentary organic matter in Anisian carbonate series of southern Poland is studied with respect to relative sea-level fluctuations. Palynofacies patterns clearly reflect transgressive–regressive trends that are interpreted in terms of third-order cyclicity. Major flooding phases are detected by maximum abundance of marine plankton in the upper Bithynian and Pelsonian. Transgressive and highstand deposits are recognized by changes in the terrestrial input of organic particles and the relative percentages and diversity of the plankton group. The palynological data support the sequence stratigraphic interpretation based on sedimentological features and geochemical signatures. The corresponding eustatic signals of sedimentary and organic facies are discussed. The study highlights the potential of palynofacies analysis for sequence stratigraphical interpretation. 相似文献
12.
《International Geology Review》2012,54(10):1105-1117
Alterations of coal organic matter in the course of metamorphism are considered in the paper. Under the influence of temperature and pressure the organic matter contained in sedimentary rocks is liable to easier and quicker alteration than the inorganic substance. As a result of a study of oil- and coal-bearing sediments it is suggested that the transformation of the organic matter contained in coal disseminations should be used as an indicator of general sedimentary rock alterations, taking place during their submergence into higher temperatures and pressure zones. The reflectivity of vitrinite, determined by means of photocells under the microscope serves as a quantitative expression of different sedimentary rock transformation stages. Thus, 22 stages of sedimentary rock alteration have been isolated. These stages have been subdivided into 6 subgroups and 3 groups. Paragenetic relations between coal alterations and oil distribution in sedimentary rocks of different stages have been established.—Auth. English Summary. 相似文献
13.
A Primary Observation on Palynofacies of the Chuangde Section (Late Jurassic-Cretaceous), Gyangzê, Southern Tibet 
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下载免费PDF全文 A primary study on palynofacies, which concerns the paleoenvironments from the sight of association of sedimentary organic matter preserved in sedimentary rocks, is conducted for a Late Jurassic-Cretaceous succession at Gyangzê, southern Tibet. Two palynofacies are recognized, which are formed in different sedimentary environments. The one in the pelagic is infertile in organic productivity and monotonous in component and is dominated by AOMA, while the other, being closely bound up with the slope, is characterized by abundant black phytoclasts that are possibly of algal origin and contains much AOM. The influence of terrestrial input is clear in the latter, for particles generated from terrestrial plants are common. A number of fossil spores and pollen together with some dinocysts are discovered, but they are normally in a bad condition of preservation. Nevertheless, this convinces us that the late Jurassic-Cretaceous succession in the Gyangzê area has a potential for palynological stratigraphy. We have also proved that the volume of PM can achieve similar results in presenting the productivity of organic matter as the weight of TOC does. This technique is much easier in the laboratory than that we do with TOC. 相似文献
14.
A Primary Observation on Palynofacies of the Chuangde Section(Late Jurassic-Cretaceous),Gyangz■,Southern Tibet 下载免费PDF全文
下载免费PDF全文 LI Jianguo GUO Zhenyu Nanjing Institute of Geology Paleontology Chinese Academy of Sciences Nanjing Jiangsu 《《地质学报》英文版》2007,(6)
A primary study on palynofacies,which concerns the paleoenvironments from the sight of association of sedimentary organic matter preserved in sedimentary rocks,is conducted for a Late Jurassic-Cretaceous succession at Gyangz(?),southern Tibet.Two palynofacies are recognized,which are formed in different sedimentary environments.The one in the pelagic is infertile in organic productivity and monotonous in component and is dominated by AOMA,while the other,being closely bound up with the slope,is characterized by abundant black phytoclasts that are possibly of algal origin and contains much AOM.The influence of terrestrial input is clear in the latter,for particles generated from terrestrial plants are common.A number of fossil spores and pollen together with some dinocysts are discovered,but they are normally in a bad condition of preservation.Nevertheless,this convinces us that the late Jurassic-Cretaceous succession in the Gyangz(?)area has a potential for palynological stratigraphy.We have also proved that the volume of PM can achieve similar results in presenting the productivity of organic matter as the weight of TOC does.This technique is much easier in the laboratory than that we do with TOC. 相似文献
15.
A Primary Observation on Palynofacies of the Chuangde Section (Late Jurassic-Cretaceous), Gyangzê, Southern Tibet 下载免费PDF全文
下载免费PDF全文 A primary study on palynofacies, which concerns the paleoenvironments from the sight of association of sedimentary organic matter preserved in sedimentary rocks, is conducted for a Late Jurassic-Cretaceous succession at Gyangzê, southern Tibet. Two palynofacies are recognized, which are formed in different sedimentary environments. The one in the pelagic is infertile in organic productivity and monotonous in component and is dominated by AOMA, while the other, being closely bound up with the slope, is characterized by abundant black phytoclasts that are possibly of algal origin and contains much AOM. The influence of terrestrial input is clear in the latter, for particles generated from terrestrial plants are common. A number of fossil spores and pollen together with some dinocysts are discovered, but they are normally in a bad condition of preservation. Nevertheless, this convinces us that the late Jurassic-Cretaceous succession in the Gyangzê area has a potential for palynological stratigraphy. We have also proved that the volume of PM can achieve similar results in presenting the productivity of organic matter as the weight of TOC does. This technique is much easier in the laboratory than that we do with TOC. 相似文献
16.
《地学前缘(英文版)》2020,11(3):965-988
The sedimentary sequence containing lignite deposits in Gurha quarry of the Bikaner-Nagaur Basin(Rajasthan)has been investigated.The samples from lignite and allied shale horizons were evaluated for petrographical,palynological,palynofacies and organic geochemical inferences,to depict the source flora and to reconstruct the palaeodepositional conditions prevailed during the sedimentation.An assessment for the hydrocarbon generation potential of these deposits has also been made.The results revealed the dominance of huminite macerals and phytoclasts organic matter(OM) indicating the existence of forested vegetation in the vicinity of the depositional site.A relatively high terrigenous/aquatic ratio(TAR) and the carbon preference index(CPI) are also suggesting the contribution of higher plants in the peat formation.However,the n-alkane distributions,maximizing at n-C17 and n-C29,showed inputs from the algal communities along with the higher plant derived organic matters.Recovered palynomorphs of the families Onagraceae,Meliaceae,Arecaceae,Rhizophoraceae,Rubiaceae,Ctenolophonaceae, etc.together with oleanene and ursane types of triterpenoids suggest the contribution from angiosperms source vegetation.Interestingly,the presence of Araucareaceae and Podocarpaceae pollen grains shows the existence of gymnosperms vegetation.Further,the presence of tetracyclic diterpanes;demethylated entbeyerane,sandaracopimarane,pimarane,and Kaurane type of compounds confirms the contribution of conifers.The variation in the values of the coefficient of non-equality(H:0.68%-7.56%),the standard deviation(8:0.04%-0.16%) and the coefficient of variability(V:16.10%-46.47%),also shows the heterogeneity in the source organic matter.The various petrographical indices,palynological entities,and geochemical parameters indicate that the peatforming vegetation was accumulated under a mixed environment and fluctuating hydrological settings.The interpretation of palynofacies data on APP(Amorphous organic matter-Phytoclast-Palynomorphs) diagram suggests that the accumulation of organic matter occurred in a dysoxic-suboxic condition in a proximal(to land)setting with the shift to an anoxic condition in distal setting towards the termination of sedimentation.The huminite(ulminite) reflectance(R_r) values(av.0.28%) showed a good relationship with average T_(max) value(414℃),suggesting the immaturity.The TOC content ranges of 13-59 wt.%,and HI values vary between 101 and 546 mg HC/g TOC in the studied samples.Collectively,the studied lignite and shale samples have the admixed kerogens(Type Ⅲ-Ⅱ) and exhibit the ability to generate the gaseous to oil hydrocarbons upon maturation. 相似文献
17.
18.
Classification and analysis of palynodebris from the Palaeocene sediments of the Forties Field 总被引：3，自引：0，他引：3
Sedimentary organic matter behaves as sedimentary particles and this study attempts to interpret its occurrence in the Palaeocene sands and mudstones of the Forties Field of the North Sea. New nomenclature and classification of this palynodebris are presented and are used to make quantitative counts of the palynodebris from nearly 600 samples of known sedimentary character. The new categories are further refined by objective testing of the data by Principal Components Analysis and Cluster Analysis. It is argued that two types of sedimentary organic matter are of particular value because they are preferentially deposited in different environments: palynowafers are most commonly deposited in the submarine fan lobes and channel complexes and amorphous matter occurs mostly in the lower energy basin plain sediments. 相似文献
19.
Ryadh Younis Al-Obaidi Thamer Khazal Al-Ameri Amer Jassim Al-Khafaji 《Arabian Journal of Geosciences》2013,6(9):3303-3312
Palynological analysis were done on 12 rock samples for Ratawi Formation from Rumailah well 131 and eight samples for the same formation from Zubair well 47, South Iraq, to extract sedimentary organic matters. Microscopic examination led to diagnose large numbers of spores, pollen, dinoflagellates (proximat, cavate, and chorate), foraminifera, melanogen, hylogen, and amorphogen. Three palynological facies were determined on the bases of percentages of sedimentary organic matter and palynomorphs from two sections. Analysis of these palynofacies clarified Ratawi Formation as deposited from environments ranging from delta and lagoon (suboxic–dysoxic) to shelf facies (anoxic near the shore–suboxic) with the presence of some layers deposited from semideep open marine environment (bathyal). Organic geochemical analysis of total organic carbon and Rock Eval pyrolysis were done to determine quantity, quality, and degree of maturation of the kerogen. Poor to medium proportion of total organic carbon of kerogen types II and III within a catagenesis stage are recorded in these rocks, and hence, poor hydrocarbon generation could be suggested for these strata. 相似文献