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首页> 外文期刊>Journal of earth system science >Bathymetry and sediments on the carbonate platform off western India: Significance of Halimeda bioherms in carbonate sedimentation
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Bathymetry and sediments on the carbonate platform off western India: Significance of Halimeda bioherms in carbonate sedimentation

机译：印度西部碳酸盐岩平台上的测深法和沉积物：Halimeda生物herms在碳酸盐岩沉积中的意义

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Bathymetry across the carbonate platform off western India indicated small-size pinnacles and their lateral coalescence into 2 -6-m high mounds landward, and linear elongated carbonate ridges and troughs, mounds and banks up to a height of 20-m seaward of the platform. Seismic data indicated that these mounds were transparent with no rigid internal structure and can be defined as bioherms. The sediments were abundantly aragonite faecal pellets, Halimeda grains and ooids and their radiocarbon ages ranged from 11 to 7.5 ka BP. It appears that the growth of Halimeda bioherms on the platform was facilitated by intense upwelling during the early Holocene. The terrigenous sediments brought by rivers were deposited in the inner shelf and have not affected the growth of bioherms. It is estimated that the platform comprises at least 1.85 Gt of mass CaCO$_3$ accumulated during the early Holocene and comparable to those on the Great Barrier Reef. Halimeda bioherms produce abundant carbonate sediments and their growth period represents a geological carbonate sink and release of high CO$_2$ to the atmosphere. Detailed shallow seismic studies and sediment cores are needed to quantify the exact mass content of CaCO$_3$ and model climate change during the early Holocene.
机译：横跨印度西部碳酸盐岩平台的测深表明，小尖峰及其横向合并成2 -6-m高的丘陵向内，线性的细长碳酸盐岩脊和波谷，丘陵和河岸直至平台向海20 m的高度。地震数据表明这些土墩是透明的，没有刚性内部结构，可以定义为生物礁。沉积物为大量文石粪便颗粒，Halimeda颗粒和卵石，其放射性碳年龄范围为11至7.5 ka BP。看来，全新世早期强烈的上升流促进了平台上Halimeda生物礁的生长。河流带来的陆源沉积物沉积在内陆架上，并没有影响生物群落的生长。据估计，该平台至少包含1.85 Gt的全新世CaCO $ _3 $累积量，与大堡礁上的相仿。 Halimeda生物礁产生大量的碳酸盐沉积物，它们的生长期代表着一个地质碳酸盐汇，并向大气中释放出高水平的CO $ _2 $。需要详细的浅层地震研究和沉积岩心来量化CaCO 3的确切质量含量，并模拟全新世早期的气候变化。

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