泰国北部中三叠世放射虫硅质岩及其地球化学和沉积环境意义

Bedded cherts collected from northern Thailand, including Chiang Dao, Lamphun and Den Chai contain Middle Triassic radiolarian faunas. The faunas from Chiang Dao can be divided into two assemblages. The first assemblage includes Eptingium and other co-occurring species such as Cryptostephanidium cornigerum Dumitric?, Plafkerium antiquum Sugi-yama, Pseudostylosphaera compacta (Nakaseko and Nishimura), P. longispinosa Kozur and Mostler, P. acrior (Bragin), P. japonica (Nakaseko and Nishi-mura), Parasepsagon sp. cf. P. variabilis (Nakaseko and Nishimura), Hozmadia sp. cf. H. gifuensis Sugi-yama, Triassospongosphaera multispinosa (Kozur and Mostler), Celluronta donax Sugiyama, Oertlispongus sp. cf. O. diacanthus Sugiyama, Paroertlispongus multispinosus Kozur and Mostler, etc. The second as-semblage consists of Triassocampe deweveri (Na-kaseko and Nishimura), Yeharaia annulata Nakaseko and Nishimura, Hindeostylosphaera spinulosa (Na-kaseko and Nishimura), Plafkerium contortum Dumitric?, Kozur and Mostler, Pseudostylosphaera goestlingensis (Kozur and Mostler), P. timorensis Sa-shida and Kamata and Paroertlispongus rarispinosus Kozur and Mostler. These assemblages indicate upper and uppermost Anisian, respectively.     

Geochemistry of Middle Triassic Radiolarian Cherts from Northern Thailand:Implication for Depositional Environment

Geochemical analysis reveals that Middle Triassic radiolarian cherts from northern Thailand,including Chiang Dao,Lamphun and Den Chai,are of biogenic origin.These cherts present slightly high SiO2 content which was possibly modified by diagenetic alteration and migration processes as indicated by negative correlation between SiO2 and most of the other major elements.The relatively high content of Cr,Zr,Hf,Rb and Th and high positive correlation of these elements with Al and Ti from the majority of cherts su...     

Triassic Epithermal Au and Porphyry Related Cu-Mo Mineralization of the Chatree Deposit, Central Thailand

Please refer to the attachment(s) for more details     

中国的三叠纪恐龙足迹化石

中国是世界上恐龙足迹化石最丰富的国家之一,中国发现的恐龙足迹化石绝大多数属于侏罗纪和白垩纪的,三叠纪恐龙足迹非常少见。目前在四川彭县、天全和富顺发现的晚三叠世恐龙足迹化石是中国发现的时代最早的恐龙足迹化石。由于中国还未发现三叠纪恐龙骨骼化石,因此这些恐龙足迹化石填补了中国恐龙研究的一段空白。目前发现的三叠纪恐龙足迹化石数量较少、特征不很明显、分类位置也不是很明确,因此今后还需要进一步加强四川盆地晚三叠世恐龙足迹化石的调查和深入研究。     

泰国清莱地区三叠纪南邦群碎屑锆石LA-ICP-MSU-Pb年龄及其地质意义

对于中国滇西和东南亚地区古特提斯缝合带对比一直存在诸多争议。在泰国清莱地区三叠纪南邦群中采集4件碎屑岩样品,进行岩石学、地球化学和锆石U-Pb测年研究。岩石学和地球化学研究表明,该套碎屑岩的源岩主要为基性—中基性岩石,卷入少量长英质岩石,物源区大地构造背景为岛弧带。所测得最古老锆石U-Pb同位素年龄为3269Ma±29Ma,绝大多数年龄集中形成3个峰值：280～250Ma、500～440Ma和1200～1100Ma,指示清莱地区三叠纪南邦群碎屑物源区主要为清莱岛弧火山岩带西部条带和前泥盆纪变质岩系。碎屑锆石年龄图谱的对比结果表明,原特提斯构造阶段之前,南邦地体与西澳大利亚发育类似构造—热事件;在原特提斯构造阶段之后,其构造—热事件特征与扬子构造域相类似,指示古特提斯洋的主洋盆应该在南邦地体以西,支持清迈构造带代表古特提斯主洋盆的观点。     

泰国北部三叠系Lampang群Doi Long组的有孔虫组合与沉积环境

A rich foraminiferal assemblage, consisting of abundant Aulotortus sinuosus and A. tumidus in association with Lamelliconus multispirus, Endoteba ex gr. controversa, E. ex gr. badouxi, Endotebanella kocaeliensis, Endotriada tyrrhenica, Endotriadella wirzi, Malayspirina fontainei, Ammobaculites rhaeticus, Diplotremina astrofimbriata, Agathammina austroalpina, and others, was found in the Doi Long Formation of the Triassic Lampang Group, Northern Thailand. These foraminifers suggest that the formation is referable to the Carnian (early Late Triassic), which is consistent with the age estimated by ammonoids. In microfacies, peloidal grainstone, bioclastic grainstone, sponge-microbial boundstone, and oolitic grainstone were recognized in the Doi Long Formation. Based on microfacies, three depositional facies, the lagoon facies, reef facies, and shoal facies, are recognized in this formation. These lines of evidence are suggestive that the Doi Long Formation was deposited in a reef or bank setting rather than a ramp setting.     

Characteristics of Triassic epithermal Au mineralization at the Q prospect,Chatree mining area,Central Thailand

The Chatree deposit is located in the Loei‐Phetchabun‐Nakhon Nayok volcanic belt that extends from Laos in the north through central and eastern Thailand into Cambodia. Gold‐bearing quartz veins at the Q prospect of the Chatree deposit are hosted within polymictic andesitic breccia and volcanic sedimentary breccia. The orebodies of the Chatree deposit consist of veins, veinlets and stockwork. Gold‐bearing quartz veins are composed mainly of quartz, calcite and illite with small amounts of adularia, chlorite and sulfide minerals. The gold‐bearing quartz veins were divided into five stages based on the cross‐cutting relationship and mineral assemblage. Intense gold mineralization occurred in Stages I and IV. The mineral assemblage of Stages I and IV is characterized by quartz–calcite–illite–laumontite–adularia–chlorite–sulfide minerals and electrum. Quartz textures of Stages I and IV are also characterized by microcrystalline and flamboyant textures, respectively. Coexistence of laumontite, illite and chlorite in the gold‐bearing quartz vein of Stage IV suggests that the gold‐bearing quartz veins were formed at approximately 200°C. The flamboyant and brecciated textures of the gold‐bearing quartz vein of Stage IV suggest that gold precipitated with silica minerals from a hydrothermal solution that was supersaturated by boiling. The δ¹⁸O values of quartz in Stages I to V range from +10.4 to +11.6‰ except for the δ¹⁸O value of quartz in Stage IV (+15.0‰). The increase in δ¹⁸O values of quartz at Stage IV is explained by boiling. P_H2O is estimated to be 16 bars at 200°C. The f_CO2 value is estimated to be 1 bar based on the presence of calcite in the mineral assemblage of Stage IV. The total pressure of the hydrothermal solution is approximately 20 bars at 200°C, suggesting that the gold‐bearing quartz veins of the Q prospect formed about 200 m below the paleosurface.     

The Triassic Formations of Kueichou

正 Triassic fossils of Kueichou were made known nearly half a century ago~1. Subsequent investigators have from time to time brought back new materials, but they are in general more or less fragmentary in nature. Through successive trips     

泰国清莱地区三叠纪南邦群碎屑锆石LA-ICP-MS U-Pb年龄及其地质意义

对于中国滇西和东南亚地区古特提斯缝合带对比一直存在诸多争议。在泰国清莱地区三叠纪南邦群中采集4件碎屑岩样品,进行岩石学、地球化学和锆石U-Pb测年研究。岩石学和地球化学研究表明,该套碎屑岩的源岩主要为基性—中基性岩石,卷入少量长英质岩石,物源区大地构造背景为岛弧带。所测得最古老锆石U-Pb同位素年龄为3269Ma±29Ma,绝大多数年龄集中形成3个峰值：280~250Ma、500~440Ma和1200~1100Ma,指示清莱地区三叠纪南邦群碎屑物源区主要为清莱岛弧火山岩带西部条带和前泥盆纪变质岩系。碎屑锆石年龄图谱的对比结果表明,原特提斯构造阶段之前,南邦地体与西澳大利亚发育类似构造—热事件;在原特提斯构造阶段之后,其构造—热事件特征与扬子构造域相类似,指示古特提斯洋的主洋盆应该在南邦地体以西,支持清迈构造带代表古特提斯主洋盆的观点。     

泰国清莱地区三叠纪南邦群碎屑锆石LA-ICP-MS U-Pb年龄及其地质意义

对于中国滇西和东南亚地区古特提斯缝合带对比一直存在诸多争议。在泰国清莱地区三叠纪南邦群中采集4件碎屑岩样品,进行岩石学、地球化学和锆石U-Pb测年研究。岩石学和地球化学研究表明,该套碎屑岩的源岩主要为基性—中基性岩石,卷入少量长英质岩石,物源区大地构造背景为岛弧带。所测得最古老锆石U-Pb同位素年龄为3269Ma±29Ma,绝大多数年龄集中形成3个峰值：280~250Ma、500~440Ma和1200~1100Ma,指示清莱地区三叠纪南邦群碎屑物源区主要为清莱岛弧火山岩带西部条带和前泥盆纪变质岩系。碎屑锆石年龄图谱的对比结果表明,原特提斯构造阶段之前,南邦地体与西澳大利亚发育类似构造—热事件;在原特提斯构造阶段之后,其构造—热事件特征与扬子构造域相类似,指示古特提斯洋的主洋盆应该在南邦地体以西,支持清迈构造带代表古特提斯主洋盆的观点。     

The First Upper Triassic Vertebrate Locality in Antarctica

In December 1999 we collected bones of two small reptiles from Upper Triassic mudstone on Mount Dearborn in southern Victoria Land, Antarctica. One specimen includes indeterminate limb fragments of a small reptile and the other is a tusk of a small dicynodont. We found both specimens in loose clasts on a slope of fine-grained strata above the second major channel-form sandstone above the base of member C in the Lashly Formation. The fossils occur in medium gray mudstone of the same lithology as the surrounding bedrock. Lashly member C at Mount Dearborn and in southern Victoria Land is composed of fining-upward cycles. At Mount Dearborn the cycles begin with channel-form, medium- to fine-grained sandstone. Quartz pebbles and cobbles occur at the base and in lenses with mudstone clasts. Lenses of coal occur along bedding planes and scours. The cycles fine upward gradually from sandstone to siltstone and carbonaceous mudstone with coal at the top. The Dicroidium flora is better preserved in the upper part of the cycles. A palynomorph assemblage from one of the bone-bearing samples suggests a Late Triassic (Carnian) age for the locality.This is the first report of Upper Triassic vertebrates in Antarctica and also of terrestrial vertebrates in Victoria Land. All previous vertebrate localities have been in non-carbonaceous beds in the central Transantarctic Mountains. The discovery expands the sequence of tetrapod occurrences in Lower, Middle and Upper Triassic and Lower Jurassic rocks in the Transantarctic Mountains. It appears that reptilian faunas managed to inhabit high latitudes (>60°), at least intermittently, for a period of 50 million years, suggesting a relatively warm climate for parts of Antarctica during those times.     

鄂尔多斯盆地中三叠统与上三叠统地层界线讨论

针对延长组地层划分的争议,开展了延长组孢粉组合、岩石学特征、湖盆演化规律等对比分析,结果显示长8－长10地层与长1－长7地层差异显著。其中,长8－长10油层组沉积期,地势平坦,河流、三角洲和滨浅湖沉积发育,岩石成分成熟度低,孢粉组合中蕨类植物孢子占优势,中三叠世的重要分子Punctatisporites、Verrucosisporites含量较高;长7油层组沉积期深湖范围宽广,盆地西南、西部地区长7砂岩中石英含量明显提高,岩石类型发生较大的改变,西缘和西南缘沉积体系也由辫状河、辫状河－三角洲体系演化成冲积扇、扇三角洲沉积体系,该段地层孢子花粉含量相近,以具有晚三叠世色彩的Duplexisporites大量出现为特征。此外,在盆地西部、西南及湖盆中部地区,长7底部稳定分布的一套凝灰岩薄层,记录了同期的火山、岩浆活动等地质事件,为早印支运动的重要表现形式,因此长7与长8之间地层界线为中三叠统与上三叠统界线。     

四川盆地中三叠统-上三叠统马鞍塘组天然气藏特征和有利勘探地区

四川盆地中三叠统雷口坡组勘探已近40年,但迄今为止只发现了两个大中型气藏.近年来,雷口坡组钻井油气显示活跃,展示了良好的勘探前景.四川盆地中三叠统气藏储层主要位于底部雷一段、顶部雷三一雷四段,天然气主要来源于上二叠统龙潭组和上三叠统须家河组烃源岩,各气藏天然气组分特征也不尽相同,储集空间均以各类次生溶蚀孔隙为主,多为低...     

四川盆地中三叠统-上三叠统马鞍塘组天然气藏特征和有利勘探地区

四川盆地中三叠统雷口坡组勘探已近40年,但迄今为止只发现了两个大中型气藏.近年来,雷口坡组钻井油气显示活跃,展示了良好的勘探前景.四川盆地中三叠统气藏储层主要位于底部雷一段、顶部雷三一雷四段,天然气主要来源于上二叠统龙潭组和上三叠统须家河组烃源岩,各气藏天然气组分特征也不尽相同,储集空间均以各类次生溶蚀孔隙为主,多为低-中孔低渗的孔隙型或裂缝一孔隙型储层.气藏盖层发育,均具备良好的直接盖层和区域盖层条件.上三叠统马鞍塘组储层主要位于其顶、底部的(藻)砂屑灰岩和泥晶灰岩,烃源岩和盖层与雷三、雷四段成藏条件相似.本文将四川盆地中三叠统一上三叠统马鞍塘组生储盖组合特征概括为两种类型:1)上二叠统龙潭组烃源岩+雷一-雷二段滩相储层+雷口坡组膏盐盖层;2)上三叠统烃源岩+雷三-雷四段-马鞍塘组底部(礁)滩相储层和(或)风化壳古岩溶储层+上三叠统泥质盖层.将来的油气勘探应更加重视对第二组合的关注.龙门山中南段前缘地区应是中三叠统雷三一雷四段和上三叠统马鞍塘组油气勘探最有利的地区.     

Triassic sequences in turkey

In general, Triassic rocks throughout the studied areas are dominated by limestones locally containing foraminifers and conodonts. Interbedded terrigenous clastics are present in the Lower Triassic wherever it occurs, but otherwise are restricted to the Upper Triassic sections of Hadim. The Lower-Middle Triassic rocks of Hadim were deposited in a persistent tidal lagoon, invaded from time to time by marine faunas when the enclosing barrier shoal was breached. At other times, the lagoon became very shallow and hypersaline but never dried out completely. Occasionally the lagoon was filled with clastics deposited by sheet-floods from the land. At the beginning of the Upper Triassic, tectonic uplift of the hinterland resulted in a massive supply of terrigenous gravels and sand to the marginal lagoon. When this supply ceased, marine influence reasserted itself, forming a semi-enclosed sea.     

川西德格—巴塘一带的晚三叠世地层

四川西部金沙江畔德格—巴塘一带出露一套低级变质的火山-沉积岩系,含有丰富的双壳类、腕足类、头足类,特别是六射珊瑚等化石。由于构造复杂,过去对这套地层形成时期的构造环境和地层分层曾有不同认识。根据所含古生物化石和同邻区对比,将这套地层的时代划归晚三叠世,并自老而新划分为3个组：打马洞组、曲嘎寺组与图姆沟组。其中打马洞组为新建立的地层单位。     

中国西南部三叠纪海相生物群及其集群死亡事件

中国西南部三叠纪海相生物群主要有海生爬行类、鱼类、棘皮类、菊石类、双壳类、腹足类及节肢动物等,分布范围包括贵州关岭、兴义、盘县和云南罗平一带的中—上三叠统关岭组、竹竿坡组及小凹组灰黑色钙质泥岩及泥质灰岩地层。这些生物群高度分异,数量丰富,反映了地球生命在经历了二叠纪末大绝灭以及早三叠世的相对停滞期后,在中三叠世开始进入迅速辐射演化的新阶段。这样不同类型和不同生长阶段的大量海洋动物同时集群死亡,并被迅速封埋保存成化石,反映了当时多次发生突发灾变事件。这与该生物群所处的古地理位置恰好位于华南板块、江南造山带及印度支那板块交界区构造活动带的海湾盆地环境有密切关系。推测那里滞流深水区还原环境形成硫化氢水团,在印支造山运动期间多次发生的海底地震及火山活动时,其硫化氢水团及海底富含碳酸盐的软泥泛起,混合成高密度有毒浊水团,侵入海洋生物群生存的清澈浅水区,导致大量海洋生物中毒窒息,出现突发性集群死亡,随后又被有毒浊水团携带的泥沙迅速封埋,在以后的成岩作用中保存为灰黑色钙质泥岩及泥质灰岩中的精美化石。