The heterogeneous abyss

Smith, Craig R.

doi:10.1073/pnas.2010215117

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i

The heterogeneous abyss

2020
By Smith, Craig R.
Source: PNAS 117 (29) 16729-16731 https://doi.org/10.1073/pnas.2010215117

[PDF-560.01 KB]

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Journal Title:

Proceedings of the National Academy of Sciences
Personal Author:

Smith, Craig R.
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; Ocean Exploration Program ; CICOES (Cooperative Institute for Climate, Ocean and Ecosystem Studies)

OAR (Oceanic and Atmospheric Research) ; Ocean Exploration Program ; CICOES (Cooperative Institute for Climate, Ocean and Ecosystem Studies) Less -
Description:

The abyssal seafloor, that is, ocean depths of∼3,000 to 6,000 m, is widely considered simply to bevast, featureless plains of sediment. For example,Wikipedia asserts that“abyssal plains cover more than50% of the Earth’s surface”and“are among the flat-test, smoothest, and least explored regions on Earth”(1). Featureless tracts of mud make intuitive sensesince abyssal plains are formed by the deposition ofthick blankets of fine-grained sediments sinking fromthe surface ocean or transported as turbidity currentsdown continental margins. In most of the abyss, espe-cially on seafloors>10 My old, this sediment blanket istens to thousands of meters thick (2) and seems likelyto bury or smoothen most of the irregularities in sea-floor crust (e.g., basalt pillows) formed at midoceanspreading centers. Riehl et al. in PNAS (3) help todispel this notion that the abyssal seafloor is feature-less, providing evidence of extensive rocky habitatsalong transform faults in the abyss.
Keywords:

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Science Sea Technology
Source:

PNAS 117 (29) 16729-16731 https://doi.org/10.1073/pnas.2010215117
DOI:

https://doi.org/10.1073/pnas.2010215117
Pubmed ID:

32651274
Pubmed Central ID:

PMC7382280
Document Type:

Journal Article
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PMC
Main Document Checksum:

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urn:sha256:f6dfec975ce3175f61007bd8593c8130c323d16a41858f847cb7f4d080753095
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https://repository.library.noaa.gov/view/noaa/29080/noaa_29080_DS1.pdf
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The heterogeneous abyss

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