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| 1 | Geochemistry of Middle Triassic Radiolarian Cherts from Northern Thailand:Implication for Depositional Environment显示文摘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 suggest a close relation to terrigenous component.The Ce anomaly(Ce/Ce*) with geometric means ranging from 0.85 to 0.93 is compatible with that of continental margin composition(0.67-1.52) from Murray et al.(1990) which is also consistent with low Eu anomalies(Eu/Eu*,0.91-0.94).Moreover,the slightly low ratios of La and Ce NASC normalized(Lan/Cen,0.91-0.94) and the low LREE and HREE ratios in most of our samples(Lan/Ybn,0.62-0.85) are in agreement with the continental margin.The result from Lan/Cen vs.Al2O3/(Al2O3+Fe2O3) discrimination diagrams also supports the continental margin(residual basin,s.str.) interpretation.These geochemical results are compatible with geological evidence,which suggest that during the Middle Triassic,radio-larian cherts were deposited within a deeper part of a residual basin in which an accommodation space was possibly controlled by faults under extensional regime subsequent to Late Variscan(Permian) orogeny.Paleogeographi-cally,the main Paleotethys which closed during Late Triassic should be located further to the west of these study localities.This scenario is in agreement with the current view of the Tethys in this part of the world. | Hathaithip Thassanapak Mongkol Udchachon Chongpan Chonglakmani 冯庆来 | 2011 | Journal of Earth Science2011，22，6： | 8 |
| 2 | Middle Triassic Radiolarians from Cherts/Siliceous Shales in an Extensional Basin in the Sukhothai Fold Belt,Northern Thailand显示文摘More than thirty species of radiolarians are described from maroon chert and siliceous shales from the Den Chai and Santisuk sections in the east of the Sukhothai fold belt. The fauna obtained from Den Chai comprises Muelleritortis cochleata cochleata, M. cochleata tumidospina, M. expansa, Triassocampe deweveri, T. coronata, T. scalaris, Annulotriassocampe companilis, A. multisegmantatus, A. sulovensis, Pseudostylosphaera coccostyla coccostyla, P. imperspicua, Canoptum inornatus, C. levis, Corum kraineri, Spongoserrula rarauana, Orbiculiforma karnica and others. The assemblage may be correlated with those reported in the Fang-Chiang Dao and Lumphun areas in the north of Thailand and in the ChangningMenglian belt of western Yunnan, South China and suggests a late Ladinian(Middle Triassic) age. The radiolarian fauna from the Santisuk Section comprises Muelleritortis cochleata cochleata, M. sp., Striatotrissocampe nodosoannulata, Triassocampe. deweveri, T. sp., Pseudogodia? sp., Pseudostylosphaera coccostyla coccostyla, Archaeocenosphera sp., Annulotriassocampe multisegmantis, Pseudostylosphaera sp., and others which indicates a late Ladinian age. Middle Triassic radiolarian chert and siliceous shale from Den Chai and Santisuk are interpreted as having been deposited in an extensional continental margin within the Sukhothai fold belt and not in the Devonian–Permian back-arc basin of the Nan suture. These deep marine sequences were deposited in a subsiding continental margin in the Lampang-Phrae Basin. We consider these sequences to be part of the Hong Hoi Formation(Anisian–Ladinian) of the Lampang Group which, in turn, may be compared to the Choushui Formation and other associated Middle Triassic formations in the Simao Basin of South China. | Hathaithip Thassanapak Mongkol Udchachon Qinglai Feng Clive Burrett | 2017 | Journal of Earth Science2017，28，1： | 2 |
| 3 | Geochemistry of Radiolarian Cherts from a Late Devonian Continental Margin Basin,Loei Fold Belt,Indo-China Terrane显示文摘More than 42 species of well-preserved Upper Devonian radiolarians have been obtained from cherts and siliceous shales in four sections(Chom Noi, Phu Kham Phe(P), Phu Kham Phe(C) and Pha Samyod) from the NE Thailand sector of the Loei fold belt, Indochina terrane. They include Ceratoikiscum sp. cf. planistellare Foreman, Helenifore laticlavium Nazarov & Ormiston, Astroentactinia sp. cf. paronae(Hinde), Stigmosphaerostylus herculea(Foreman), S. pusilla(Hinde), S. cf. vulgaris(Won), Trilonche davidi(Hinde), T. echinata(Hinde), T. elegans Hinde, T. hindea(Hinde), T. palimbola(Foreman), T. vetusta Hinde, Polyentactinia polygonia Foreman, Spongentactinella sp. cf. windjanensis Nazarov, Archocyrtium sp.?, Palaeoscenidium sp., Triaenosphaera sp., and others. Radiolarian faunas from these sections indicate a range from lower Frasnian to Famennian. Analyses of rare earth, trace and major elements suggest that the Upper Devonian chert and siliceous successions from Loei were deposited in a continental margin environment near to a volcanic arc. These successions contain distinctive weak negative Ce anomalies with strong positive Eu anomalies which differ from Upper Devonian cherts reported from northern Thailand, the Truong Son fold belt(Laos) and from South China. Negative Ce anomalies and low to moderate Lan/Cen ratios imply proximity between the Chom Noi and Phu Kham Phe(C), which were deposited in more distal parts of the depositional basin than the Pha Samyod and Phu Kham Phe(P) samples. Most of the Pha Samyod and Phu Kham Phe(P) samples exhibit high continental-derived trace element levels including Cr, Zr, Hf, Rb, Th and in part V, which supports close proximity to terrigenous sources. Paleozoic stratigraphic sequences of the Loei fold belt and geochemical results suggest that the Upper Devonian deep marine sequences in the Loei fold belt were deposited within a rifted, continental-margin basin, possibly a back-arc basin and not in a large oceanic basin as has been previously suggested. | Hathaithip Thassanapak Mongkol Udchachon Clive Burrett Qinglai Feng | 2017 | Journal of Earth Science2017，28，1： | 2 |
| 4 | The configuration of Greater Gondwana - Evidence from LA ICPMS, U-Pb geochronology of detrital zircons from the Palaeozoic and Mesozoic of Southeast Asia and China显示文摘 | Burrett C Zaw K Meffre S Lai C K Khositanont S Chaodumrong P Udchachon M Ekins S Halpin J | 2014 | Gondwana Res2014，26，1： | 1 |
| 5 | The configuration of Greater Gondwana—Evidence from LA ICPMS, U–Pb geochronology of detrital zircons from the Palaeozoic and Mesozoic of Southeast Asia and China显示文摘 | Clive Burrett Khin Zaw Sebastien Meffre Chun Kit Lai Somboon Khositanont Pol Chaodumrong Mongkol Udchachon Samuel Ekins Jacqueline Halpin | 2014 | Gondwana Research2014，，1： | 1 |
| 6 | 印支地体泥盆纪牙形石、放射虫和竹节石组合(英文)显示文摘Devonian faunas including conodonts,radiolarians,tentaculitids and other important fossils have recently been found at several localities in the Indochina Terrane.These faunas are biostratigraphically and tectonically important. In the eastern margin of the Indochina | Hathaithip THASSANAPAK Mongkol UDCHACHON Clive BURRETT | 2012 | 地球学报2012，33，S1： | 0 |
| 7 | 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(英文)显示文摘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 | Hathaithip THASSANAPAK Mongkol UDCHACHON Chongpan CHONGLAKMANI | 2012 | 地球学报2012，33，S1： | 0 |
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