Just out | Palaeoenvironmental significance of Miocene larger benthic foraminifera from the Xisha Islands, South China Sea @ Palaeoworld


Just out @ Palaeoworld


Palaeoenvironmental significance of Miocene larger benthic foraminifera from the Xisha Islands, South China Sea


Author(s)

Zhao-Liang Ma, Qian-Yu Li, Xin-Yu Liu, Wei Luo, Dao-Jun Zhang, You-Hua Zhu


Abstract:

We studied 344 samples from Well XK-1 in Xisha Islands, South China Sea, and identified 66 species of larger benthic foraminifera, providing critical evidence for biostratigraphy and palaeoenvironmental interpretation of the Miocene reef carbonate sequence. Three assemblages are recognized, namely, Spiroclypeus higginsiBorelis pygmaeus Assemblage (Letter Stage Te5, Early Miocene, 1256.28–1180.15 m), NephrolepidinaMiogypsina Assemblage (Tf, Middle Miocene, 1031.10–577.04 m), and CycloclypeusHeterostegina Assemblage (Tg, Late Miocene, 468.13–380.42 m). On the basis of the palaeoecological preference of the larger foraminifera, we interpret that the Miocene carbonate sequence was deposited mainly in a warm tropical shallow water environment, characterized by five stages of continuous long-term evolution: backreef lagoon to shelf in the Early Miocene, normal to frontal reef in the early Middle Miocene, backreef lagoon to shelf in the later Middle Miocene, normal to frontal reef in the early Late Miocene, and proximal forereef shelf in the later Late Miocene.


Keywords: Larger benthic foraminifera; Well XK-1; Miocene; Biostratigraphy; Palaeoenvironments


DOI: 10.1016/j.palwor.2017.05.007


READ IT HERE: http://www.sciencedirect.com/science/article/pii/S1871174X1730029X


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