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Early Pleistocene origin of reefs around Lanai, Hawaii

Earth and Planetary Science Letters

By:
, , , , , , and
DOI: 10.1016/j.epsl.2009.12.029

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Abstract

A sequence of submerged terraces (L1-L12) offshore Lanai was previously interpreted as reefal, and correlated with a similar series of reef terraces offshore Hawaii island, whose ages are known to be < 500 ka. We present bathymetric, observational, lithologic and 51 87Sr/86Sr isotopic measurements for the submerged Lanai terraces ranging from - 300 to - 1000 m (L3-L12) that indicate that these terraces are drowned reef systems that grew in shallow coral reef to intermediate and deeper fore-reef slope settings since the early Pleistocene. Age estimates based on 87Sr/86Sr isotopic measurements on corals, coralline algae, echinoids, and bulk sediments, although lacking the precision (??? ?? 0.23 Ma) to distinguish the age-depth relationship and drowning times of individual reefs, indicate that the L12-L3 reefs range in age from ??? 1.3-0.5 Ma and are therefore about 0.5-0.8 Ma older than the corresponding reefs around the flanks of Hawaii. These new age data, despite their lack of precision and the influence of later-stage submarine diagenesis on some analyzed corals, clearly revise the previous correlations between the reefs off Lanai and Hawaii. Soon after the end of major shield building (??? 1.3-1.2 Ma), the Lanai reefs initiated growth and went through a period of rapid subsidence and reef drowning associated with glacial/interglacial cycles similar to that experienced by the Hawaii reefs. However, their early Pleistocene initiation means they experienced a longer, more complex growth history than their Hawaii counterparts. ?? 2009 Elsevier B.V.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Early Pleistocene origin of reefs around Lanai, Hawaii
Series title:
Earth and Planetary Science Letters
DOI:
10.1016/j.epsl.2009.12.029
Volume
290
Issue:
3-4
Year Published:
2010
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Earth and Planetary Science Letters
First page:
331
Last page:
339
Number of Pages:
9