Carbon released by sill intrusion into young sediments measured through scientific drilling
نویسندگان
چکیده
Abstract The intrusion of igneous sills into organic-rich sediments accompanies the emplacement provinces, continental rifting, and sedimented seafloor spreading. Heat from intruding in these settings alters sedimentary organic carbon, releasing methane other gasses. Recent studies hypothesize that carbon released by this mechanism impacts global climate, particularly during large province emplacements. However, direct sill intrusion, including release, remain insufficiently quantified. Here, we present results International Ocean Discovery Program (IODP) Expedition 385 comparing drill-core wireline measurements correlative strata at adjacent sites cored Guaymas Basin, Gulf California, one altered a recently intruded unaffected. We estimate 3.30 Mt were due to representing an order magnitude less than inferences outcrops modeling would predict. This attenuated release can be attributed shallow high heat capacity young, high-porosity sediments. Shallow also sub-seafloor cycling disrupting advective fluxes, it compacts underlying sediments, increasing potential response subsequent intrusions.
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ژورنال
عنوان ژورنال: Geology
سال: 2023
ISSN: ['0091-7613', '1943-2682']
DOI: https://doi.org/10.1130/g50665.1