Skip to main content
    • Aa
    • Aa

Early Permian radiolarians from the extension of the Sa Kaeo Suture in Cambodia – tectonic implications


A reconnaissance survey of part of western Cambodia has found quarries in and near the town of Pailin containing chert, basalt, volcaniclastic rocks, gabbro and serpentinite. Abandoned quarries contain chert and basalt clasts in a volcaniclastic matrix and may constitute a mélange. A new, recently active, quarry contains these rock units in close and coherent contact but they lack the serpentinitic matrix of the Thung Kabin Mélange of eastern Thailand. The rock units are in close contact and may best be described collectively as a dismembered ophiolite. The mélange–ophiolite association constitutes a 3 km wide, 20 km long E–W belt separating a northern 200 km2 block of the mainly amphibolitic Pailin Crystalline Complex from a southern area of Triassic submarine fan siliciclastic rocks. The cherts yield the first documented radiolarian fauna from Cambodia and include a moderately well-preserved Asselian–Sakmarian age fauna consisting of Pseudoalbaillella sakmarensis, Pseudoalbaillella scalprata morphotype scalprata, Pseudoalbaillella sp. cf. P. simplex, Pseudoalbaillella u-forma morphotype II, Pseudoalbaillella sp. cf. P. elegans, Pseudoalbaillella sp. cf. P. lomentaria, Albaillella sp., Pseudoalbaillella spp., Trilonche? sp., Latentifistularia gen. et sp. indet. and Entactinaria gen. et sp. indet. The Pailin ophiolitic rocks, mélange and volcanic rocks occur within a generally E–W-trending belt, which suggests that the Sa Kaeo Suture does not extend southeastwards paralleling the Thai–Cambodian border, nor extend under the Cardamom Mountains but, rather, extends eastwards into Cambodia and possibly then turns southwards along the strike of the Pursat–Kampot Fold Belt.

Corresponding author
Author for correspondence:
Linked references
Hide All

This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

F. Arboit , A. S. Collins , C. K. Morley , R. King & K. Amrouch 2016. Detrital zircon analysis of the southwest Indochina terrane, central Thailand: unravelling the Indosinian orogeny. Geological Society America Bulletin 128, 1024–43.

C. D. Blome & K. M. Reed 1992. Permian and Early (?) Triassic radiolarian faunas from the Grindstone terrane, central Oregon. Journal of Paleontology 66, 351–83.

C. F. Burrett , Khin Zaw , S. Meffre , C. K. Lai , S. Khositanont , P. Chaodumrong , M. Udchachon , S. Ekins & J. Halpin 2014. The configuration of Greater Gondwana—evidence from U–Pb geochronology of detrital zircons from the Palaeozoic and Mesozoic of Southeast Asia and China. Gondwana Research 26, 3151.

C. Burrett , M. Udchachon , H. Thassanapak & A. Chitnarin 2015. Conodonts, radiolarians and ostracodes from the Permian E-lert Formation, Loei Fold Belt, Indochina Terrane. Geological Magazine 152,106–42.

W. Cornell & R. D. Simpson 1985. New Permian albaillellid radiolarians from West Texas. Micropaleontology 31, 271–9.

H. Fontaine 2002. Permian of Southeast Asia: an overview. Journal of Asian Earth Science 20, 567–88.

B. K. Holdsworth 1969. Namurian Radiolaria of the genus Ceratoikiscum from Staffordshire and Derbyshire, England. Micropaleontology 15, 221–9.

B. K. Holdsworth 1977. Paleozoic Radiolaria; stratigraphic distribution in Atlantic borderlands. In Stratigraphic Micropaleontology of Atlantic Basins and Borderlands (ed. F. M. Swain ), pp. 167–84. Amsterdam: Elsevier.

B. K. Holdsworth & D. L. Jones 1980. Preliminary radiolarian zonation for Late Devonian through Permian time. Geology 8, 281–5.

K. Ishida 1985. Discovery of Permian radiolarians from the pelitic rocks in the Middle Zone of the Chichibu Belt in eastern part of Tokushima Prefecture, Shikoku. The Journal of the Geological Society of Japan 91, 155–6 (in Japanese).

B. Jasin & C. A. Ali 1997. Lower Permian Radiolaria from the Pos Blau area, Ulu Kelantan, Malaysia. Journal of Asian Earth Sciences 15, 327–39.

T. Kurihara & M. Kametaka 2008. Radiolaria-dated Lower Permian clastic-rock sequence in the Fukuji area of the Hida-gaien terrane, central Japan, and its inter-terrane correlation across Southwest Japan. Island Arc 17, 531–45.

H. Y. Ling , R. D. Forsythe & R. C. Douglass 1985. Late Paleozoic microfaunas from southernmost Chile and their relation to Gondwanaland forearc development. Geology 13, 357–60.

I. Metcalfe 1996. Gondwanaland dispersion, Asian accretion and evolution of eastern Tethys. Australian Journal of Earth Sciences 43, 605–23.

X. Nie , Q. Feng , I. Metcalfe , A. Baxter & G. Liu 2016. Discovery of a Late Devonian magmatic arc in the southern Lancanjiang zone, western Yunnan: geochemical and zircon–Pb geochronological constraints on the evolution of Tethyan ocean basins in SW China. Journal of Asian Earth Sciences 118, 3250.

J. E. A. Pessagno & R. L. Newport 1972. A new technique for extracting radiolaria from radiolarian chert. Micropaleontology 18 (2), 231–4.

X. Qian , Q. L. Feng , Y. J. Wang , C. Chonglakmani & D. Monjai 2016. Geochronological and geochemical constraints on the mafic rocks along the Luang Prabang zone: Carboniferous back-arc setting in northwest Laos. Lithos 245, 6075.

M. Ridd & C. K. Morley 2011. The Khao Yai Fault on the southern margin of the Khorat Plateau and the pattern of faulting in southeast Thailand. Proceedings of the Geologists’ Association 122, 143–56.

K. Sashida , H. Igo , K. Hisada , N. Nakornsri & A. Ampornmaha 1993. Occurrence of Paleozoic and Early Mesozoic Radiolaria in Thailand (preliminary report). Journal of Southeast Asia Earth Sciences 8, 97108.

K. Sashida & S. Salyapongse 2002. Permian radiolarian faunas from Thailand and their paleogeographic significance. Journal of Asian Earth Sciences 20 (6), 691701.

S. Shen , Q. Feng , W. Yang , Z. Zhang & C. Chonglakmani 2010. Study on the geochemical characteristics of ocean-ridge and ocean island volcanic rocks in the Nan–Uttaradit zone, northern Thailand. Chinese Journal of Geochemistry 29, 175–81.

L. Shi , Q. Feng , J. Shen , T. Ito , & Z.-Q. Chen 2016. Proliferation of shallow-water radiolarians coinciding with enhanced oceanic productivity in reducing conditions during the Middle Permian, South China: evidence from the Gufeng Formation of western Hubei Province. Palaeogeography, Palaeoclimatology, Palaeoecology 444, 114.

M. Sone , I. Metcalfe & P. Chaodumrong 2012. The Chantaburi Terrane of southeastern Thailand: stratigraphic confirmation as a disrupted segment of Sukhothai Arc. Journal of Asian Earth Sciences 61, 1632.

F. C. P. Spiller 1996. Late Paleozoic radiolarians from the Bentong-Raub suture zone, Peninsular Malaysia. Island Arc 5, 91103.

N. Suzuki , S. Kojima , H. Kano , S. Yamakita , A. Misaki , M. Ehiro , S. Otoh , T. Kurihara & M. Aoyama 2005. Permian radiolarian faunas from chert in the Khabarovsk Complex, Far East Russia, and the age of each lithologic unit of the Khabarovsk Complex. Journal of Paleontology 79, 687701.

Y. J. Wang & Q. Yang 2011. Biostratigraphy, phylogeny and paleobiogeography of CarboniferousPermian radiolarians in South China. Palaeoworld 20, 134–45.

L. Xie , W. Q. Yang , G. C. Liu & Q. L. Feng 2011. Late Paleozoic Radiolaria from the Upper Triassic sedimentary mélange in Shangrila, Southwest China and its geological significance. Palaeoworld 20, 203–17.

H. Yoshida & M. Murata 1985. Permian radiolarian biostratigraphy from the north-eastern part of Saiki City, Oita Prefecture, Japan. Journal of the Geological Society of Japan 91, 525–53 (in Japanese).

Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Geological Magazine
  • ISSN: 0016-7568
  • EISSN: 1469-5081
  • URL: /core/journals/geological-magazine
Please enter your name
Please enter a valid email address
Who would you like to send this to? *



Full text views

Total number of HTML views: 2
Total number of PDF views: 18 *
Loading metrics...

Abstract views

Total abstract views: 123 *
Loading metrics...

* Views captured on Cambridge Core between 24th April 2017 - 22nd August 2017. This data will be updated every 24 hours.