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Post-obduction carbonate system development in New Caledonia (Nepoui, Lower Miocene)

机译：新喀里多尼亚（Nepoui，下中新世）的绑架后碳酸盐系统开发

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摘要

For the first time, depositional models of Lower Miocene carbonate systems from New Caledonia (Southwest Pacific) are proposed, on the basis of a sedimentological and paleoenvironmental study of both cores and outcrops. In the Nepoui area, two distinct stages of carbonate ramp development (Aquitanian Lower Nepoui and Burdigalian Upper Nepoui carbonate systems), separated by a phase of siliciclastic deltaic deposition, are evidenced. The post-obduction marine transgression of the Western New Caledonian margin occurred at approximately 24 Ma and is characterized by the development of an aggrading foraminiferal-coralline algal-scleractinian ramp system ("Chapeau Chinois Limestone") during the early Aquitanian (24-23 Ma). A retrogradational event is evidenced at approximately 23 Ma followed by the development of a shallowing upward carbonate unit (Operculina "Green Sands" and Xuudhen Limestone) during the late Aquitanian. This unit is topped by a major erosional unconformity overlain by conglomeratic deposits ("Pindai conglomerates"), and interpreted to record a significant uplift at around 21-19 Ma. During the Burdigalian, a marine transgression occurred at around 19 Ma, followed by the development of a low-angle carbonate ramp or open platform ("Nepil Limestone") up to the late Burdigalian (19-17 Ma). In both Aquitanian and Burdigalian carbonate ramps, extensive sea-grass meadows are shown to have colonized the proximal ramp environments within the euphotic zone. In the Aquitanian carbonate ramp (Lower Nepoui Formation), carbonate production within sea-grass meadows is dominated by large benthic foraminifera, together with red algae and sparse scleractinians. Mesophotic environments are characterized by large and flat lepidocyclinids, rhodoliths and platy corals whereas in deeper oligophotic settings significant carbonate producers consist mainly of large and flat benthic foraminifera. In the Burdigalian carbonate ramp (Upper Nepoui Formation), porcellaneous foraminifera thriving in sea-grass meadows together with red algae and scattered coral colonies characterize the carbonate production in the euphotic zone. Antecedent topography is regarded as a major factor controlling the extension of carbonate systems at regional and local scale. The thickness and development pattern of Lower Miocene deposits from Nepoui are dominantly controlled by tectonic subsidence. Finally, extensive sea-grass development promoted the dominance of foralgal carbonate production within the euphotic zone. (C) 2015 Elsevier B.V. All rights reserved.
机译：在岩心和露头的沉积学和古环境研究的基础上，首次提出了新喀里多尼亚（西南太平洋）的下中新世碳酸盐岩系统的沉积模型。在尼波伊地区，有两个明显的碳酸盐岩斜坡发育阶段（阿基坦下尼波伊和布迪加利安上尼波伊碳酸盐体系），由硅质碎屑三角洲沉积相隔开。新喀里多尼亚西缘的绑架后海侵发生在大约24 Ma，其特征是在早期的阿基坦时期（24-23 Ma）中形成了有孔虫－珊瑚－藻－巩膜斜坡系统（“ Chapeau Chinois Limestone”）。 ）。在大约23 Ma时出现了逆行事件，随后在阿基坦时期晚期形成了向上变浅的碳酸盐岩单元（Operculina“ Green Sands”和Xuudhen Limestone）。这个单元的顶部是砾岩沉积物（“ Pindai砾岩”）覆盖的主要侵蚀不整合面，据解释在21-19 Ma左右有明显的隆升。在布尔迪加利时期，海侵发生在19 Ma左右，随后是低角度碳酸盐岩坡道或开放平台（“ Nepil Limestone”）的发展，直至晚期布尔迪加利安（19-17 Ma）。在阿基坦和布尔迪加利的碳酸盐坡道中，大量的海草草甸被证明在富营养区内的近坡道环境中定居。在阿基坦碳酸盐岩坡道（下Nepoui组）中，海草草甸中碳酸盐的产生主要由底栖有孔虫，红藻和稀疏的巩膜藻为主。介晶环境的特征是大而平坦的鳞片睫毛类，杜鹃花和板状珊瑚，而在较深的低磷环境中，大量的碳酸盐生产者主要由大而平坦的底栖有孔虫组成。在Burdigalian碳酸盐岩坡道（上Nepoui组）中，海藻草地上蓬勃发展的有孔虫，红藻和散落的珊瑚群落是富营养区碳酸盐岩生产的特征。前期地形被认为是控制碳酸盐体系在区域和地方范围扩展的主要因素。 Nepoui下中新世沉积的厚度和发育模式主要受构造沉降控制。最后，广泛的海草开发促进了富营养区中藻类碳酸盐生产的主导地位。 （C）2015 Elsevier B.V.保留所有权利。

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  • 来源
    《Sedimentary geology》 |2016年第1期|42-62|共21页
  • 作者

    Maurizot Pierre; Cabioch Guy; Fournier Francois; Leonide Philippe; Sebih Salim; Rouillard Pierrick; Montaggioni Lucien; Collot Julien; Martin-Garin Bertrand; Chaproniere George; Braga Juan C.; Sevin Brice;

  • 作者单位

    SGNC, BP 465, Noumea 98845, New Caledonia;

    IRD, BP A5, Noumea 98848, New Caledonia;

    Aix Marseille Univ, Ctr Europeen Rech & Enseignement Geosci Environm, Ctr St Charles, CEREGE UM 34, Case 67,3 Pl Victor Hugo, F-13331 Marseille, France;

    Aix Marseille Univ, Ctr Europeen Rech & Enseignement Geosci Environm, Ctr St Charles, CEREGE UM 34, Case 67,3 Pl Victor Hugo, F-13331 Marseille, France;

    Aix Marseille Univ, Ctr Europeen Rech & Enseignement Geosci Environm, Ctr St Charles, CEREGE UM 34, Case 67,3 Pl Victor Hugo, F-13331 Marseille, France;

    SGNC, BP 465, Noumea 98845, New Caledonia;

    Aix Marseille Univ, Ctr Europeen Rech & Enseignement Geosci Environm, Ctr St Charles, CEREGE UM 34, Case 67,3 Pl Victor Hugo, F-13331 Marseille, France;

    SGNC, BP 465, Noumea 98845, New Caledonia;

    Aix Marseille Univ, Ctr Europeen Rech & Enseignement Geosci Environm, Ctr St Charles, CEREGE UM 34, Case 67,3 Pl Victor Hugo, F-13331 Marseille, France;

    Australia Natl Univ, Res Sch Earth Sci, Canberra, ACT, Australia;

    Univ Granada, Dept Estratig & Paleontol, Campus Fuentenueva, Granada 18002, Spain;

    SGNC, BP 465, Noumea 98845, New Caledonia;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Carbonates; Paleo-environments; Sea-grass; Miocene; New Caledonia; South Pacific;

    机译：碳酸盐岩;古环境;海草;中新世;新喀里多尼亚;南太平洋;

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