泰国北部 Inthanon 区与洋底岩石有关的下二叠统石灰岩:混杂的新证据

IF 1 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Geosciences Journal Pub Date : 2024-01-16 DOI:10.1007/s12303-023-0036-3
Kritsada Moonpa, Weerapan Srichan, Thasinee Charoentitirat, Thanpimol Intawong
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引用次数: 0

摘要

最近在泰国北部南奔地区的清迈大学哈里蓬猜教育中心(Hariphunchai Education Center of Chiang Mai University,HECCMU)发现了石灰岩、燧石、砂岩、泥岩或页岩以及微辉长岩等各种岩性的零星露头。这些露头位于 Inthanon 区,该区的古泰西洋板块地层非常著名。对石灰岩块进行的实地和微地层分析确认了四种微地层,分别解释为低能泻湖或平台内部、礁侧或前礁浅滩。石灰岩中的有孔虫属于二叠纪早期的萨克玛期(下西苏拉期)至昆古里亚期(上西苏拉期)。对同时存在的放射虫白垩岩、微辉长岩、浮游泥岩和浊积岩进行的现场和岩石学分析表明,石灰岩块是海山上的中洋碳酸盐堆积物,与白垩岩和辉长岩等大洋岩石混杂在一起,然后嵌入页岩基质中。结论是,这些露头石灰岩是古泰西闭合时期形成的混杂岩的一部分,对代表 Inthanon 区混杂岩中的 Cisuralian(下二叠统)碳酸盐残余具有重要意义。
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Lower Permian limestone associated with ocean floor rocks in the Inthanon Zone of northern Thailand: new evidence for mélange

Scattered outcrops of various lithologies such as limestone, chert, sandstone, mudstone or shale, and microgabbro have been recently exposed in the Hariphunchai Education Center of Chiang Mai University (HECCMU), the northern Lamphun area of the northern Thailand. The outcrops are located in the Inthanon Zone where Palaeo-Tethyan ocean plate stratigraphy is well known. Field and microfacies analysis of limestone blocks recognizes four microfacies interpreted as low-energy lagoon or platform interior and reef flank or shoal of fore-reef. Foraminiferas from the limestone are the Sakmarian (lower Cisuralian) to Kungurian (upper Cisuralian) of the early Permian in age. Field and petrographic analysis of co-occurring radiolarian chert, microgabbro, pelagic mudstone, and turbidites suggest that the limestone blocks were mid-oceanic carbonate build-ups on seamount which were chaotically mixed with oceanic rocks such as chert and gabbro and then embedded in shale matrix. It is concluded that the outcrops are part of mélange formed during the Palaeo-Tethys closure and are significant in representing the Cisuralian (lower Permian) carbonate remnant in the mélange of the Inthanon Zone.

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来源期刊
Geosciences Journal
Geosciences Journal 地学-地球科学综合
CiteScore
2.70
自引率
8.30%
发文量
33
审稿时长
6 months
期刊介绍: Geosciences Journal opens a new era for the publication of geoscientific research articles in English, covering geology, geophysics, geochemistry, paleontology, structural geology, mineralogy, petrology, stratigraphy, sedimentology, environmental geology, economic geology, petroleum geology, hydrogeology, remote sensing and planetary geology.
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