2026-06-27T23:21:30Zhttps://docta.ucm.es/rest/oai/request
oai:docta.ucm.es:20.500.14352/729732023-08-25T22:19:30Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense author Álvaro, J.J. author Holmer, Lars E. author Shen, Yanan author Popov, Leonid E. author Pour, Mansoureh Ghobadi author Zhang, Zhifei author Zhang, Zhiliang author Ahlberg, Per author Bauert, Heikki author González Acebrón, Laura 2023-06-22T12:38:25Z 2023-06-22T12:38:25Z 2022 2045-2322 10.1038/s41598-022-12379-y https://hdl.handle.net/20.500.14352/72973 https://doi.org/10.1038/s41598-022-12379-y Two massive precipitation events of polymetallic ore deposits, encrusted by a mixture of authigenic carbonates, are documented from the Cambrian of the semi-enclosed Baltoscandian Basin. δ34S (‒9.33 to ‒2.08‰) and δ33S (‒4.75 to ‒1.06‰) values from the basal sulphide breccias, sourced from contemporaneous Pb–Zn–Fe-bearing vein stockworks, reflect sulphide derived from both microbial and abiotic sulphate reduction. Submarine metalliferous deposits were triggered by non-buoyant hydrothermal plumes: plumes of buoyant fluid were trapped by water column stratification because their buoyancy with respect to the environment reversed, fluids became heavier than their surroundings and gravitational forces brought them to a halt, spreading out laterally from originating vents and resulting in the lateral dispersion of effluents and sulphide particle settling. Subsequently, polymetallic exhalites were sealed by carbonate crusts displaying three generations of ikaite-to-aragonite palisade crystals, now recrystallized to calcite and subsidiary vaterite. Th of fluid inclusions in early calcite crystals, ranging from 65 to 78 ºC, provide minimum entrapment temperatures for carbonate precipitation and early recrystallization. δ13Ccarb (‒1.1 to + 1.6‰) and δ18Ocarb (‒7.6 to ‒6.5‰) values are higher than those preserved in contemporaneous glendonite concretions (‒8.5 to ‒4.7‰ and ‒12.4 to ‒9.1‰, respectively) embedded in kerogenous shales, the latter related to thermal degradation of organic matter. Hydrothermal discharges graded from highly reduced, acidic, metalliferous, and hot (~ 150 ºC) to slightly alkaline, calcium-rich and warm (< 100 ºC), controlling the precipitation of authigenic carbonates. eng Atribución 3.0 España Submarine metalliferous carbonate mounds in the Cambrian of the Baltoscandian Basin induced by vent networks and water column stratification journal article URL https://docta.ucm.es/bitstreams/9d0ec416-d657-4d54-a238-e2b16e7b903b/download File MD5 3be71d076e28466d9e2a176223d2125a 5447020 application/pdf Submarine metalliferous carbonate mounds in the Cambrian of the Baltoscandian Basin induced by vent networks and water column stratification.pdf URL https://docta.ucm.es/bitstreams/657218e4-32c3-4c3d-9773-161848058c50/download File MD5 60e8a3a5bedf82a2c6d6590d455316b4 67913 text/plain Submarine metalliferous carbonate mounds in the Cambrian of the Baltoscandian Basin induced by vent networks and water column stratification.pdf.txt