Heat flow over a gas hydrate deposit in the Danube paleodelta: cruise MN249, 10-20/09/2023

A. Vasilev, P. Petsinski, Raina Hristova, Rosica Pehlivanova
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Abstract

This work presents results from the first purposeful in situ temperature measurements in seafloor sediments above a scalable gas hydrate deposit in the deep-water Danube paleodelta. Temperatures and temperature gradients with accuracy 5 mK and sensitivity 1 mK are measured with 3 MTL loggers with clamps (Antares GmbH) welded to a gravity corer with length of 6 m, outer diameter of 130 mm and weight ~300 kg. During the cruise MN249 on board of the Romanian R/V Mare Nigrum 10-20/10/2023, the gravity corer was deployed on 23 stations with successful temperature measurements and >3 m sediments lifting on 11 stations. Temperature gradients above the gas hydrate deposit (BSR area) are in ~20–50 mK/m when the background is ~30 mK/m. Additional data needed to determine the effects from the 2 main factors formatting temperature gradients – gas hydrate masses and sedimentation rates.
多瑙河古odelta 天然气水合物矿床上的热流:MN249 航次,10-20/09/2023
本研究首次对多瑙河古河系深水区可扩展天然气水合物矿床上方的海底沉积物进行了有目的的原位温度测量。温度和温度梯度的测量精度为 5 mK,灵敏度为 1 mK,采用 3 个带夹具的 MTL 记录器(Antares GmbH),焊接在一个长 6 米、外径 130 毫米、重约 300 千克的重力取样器上。在罗马尼亚 Mare Nigrum 号考察船于 2023 年 10 月 10 日至 20 日进行的 MN249 号考察航行期间,在 23 个站点部署了重力取样器,成功测量了温度,并在 11 个站点提升了大于 3 米的沉积物。气体水合物沉积物(BSR 区域)上方的温度梯度为 ~20-50 mK/m,而背景温度为 ~30 mK/m。需要更多数据来确定影响温度梯度的两个主要因素--天然气水合物质量和沉积速率。
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