Elsevier

Organic Geochemistry

Volume 22, Issue 6, December 1994, Pages 1029-1032
Organic Geochemistry

Note
Evidence of structure H hydrate, Gulf of Mexico continental slope

https://doi.org/10.1016/0146-6380(94)90036-1Get rights and content

Abstract

A research submarine was used to sample an amber-colored gas hydrate exposed on the sea-floor at 540 m water depth in the Gulf of Mexico continental slope, offshore Louisiana. The hydrate composition is novel for a natural occurrence because i-C5 comprises 41.1% of the total C1–C5 hydrocarbon distribution. The relative abundance of i-C5 is consistent with an hexagonal (H) lattice structure that is capable of enclosing larger hydrocarbon molecules than either structure I or II hydrates. Structure H hydrate, which has not been identified previously in nature, coexists with structure II hydrate on the Gulf slope.

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