Biodetrital mud mounds of chachao Formation (Valanginian): Features and environmental evolution, malargüe, Mendoza

The China Echada mud mound is a small dome-shaped structure that reaches a diameter of 5,40 m and is up to 2,5 m high. The mound consists of a non-framework net mainly composed of a large amount of micrite and fragments of infaunal pelecypods, as well as sponges, echinoderms, gastropods, serpulids a...

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Autores principales: Palma, R.M., Meléndez, M.N., Calvo, J.P., Lanés, S.G.
Formato: JOUR
Materias:
Calcareous rocks
Chachao formation
Cretaceous
Microfacies
Mud mounds
Neuquén basin
mud mound
sedimentary structure
Valanginian
Argentina
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00044822_v55_n4_p300_Palma
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00044822_v55_n4_p300_Palma
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spelling todo:paper_00044822_v55_n4_p300_Palma2023-10-03T13:57:34Z Biodetrital mud mounds of chachao Formation (Valanginian): Features and environmental evolution, malargüe, Mendoza Palma, R.M. Meléndez, M.N. Calvo, J.P. Lanés, S.G. Calcareous rocks Chachao formation Cretaceous Microfacies Mud mounds Neuquén basin Cretaceous mud mound sedimentary structure Valanginian Argentina The China Echada mud mound is a small dome-shaped structure that reaches a diameter of 5,40 m and is up to 2,5 m high. The mound consists of a non-framework net mainly composed of a large amount of micrite and fragments of infaunal pelecypods, as well as sponges, echinoderms, gastropods, serpulids and microbial crusts. Scattered remains of oysters, forams, ostracods and bryozoans are also present. The core of the mud mound is massive and homogeneous, and it is flanked by microbial crusts and pelecypods, echinoderm-rich skeletal packstone to wackestone. The small mound is embedded in a monotonous succession of well-bedded bioclastic packstone to -wackestone. The presence of homogeneous micrite and peloidal micrite suggests that the in situ accumulation and early stabilization of micrite sediments may have been favoured by microbial activity, followed by rapid marine cementation. Thallasinoides isp. on both the top and flanks of the mound provide evidence that the sedimentation was interrupted and also would indicate a low rate of sedimentation. The high amount of matrix and spicules in wackestone facies also suggests quiet and deep water conditions just below the fair weather wave base. The mound occupied the external section of a homoclinal ramp. The maximum development of its growth is related to sea level rise (transgression and early highstand), as evidenced by continuous vertical accretion and a lack of allocthonous sedimentation. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00044822_v55_n4_p300_Palma
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Calcareous rocks
Chachao formation
Cretaceous
Microfacies
Mud mounds
Neuquén basin
Cretaceous
mud mound
sedimentary structure
Valanginian
Argentina
spellingShingle Calcareous rocks
Chachao formation
Cretaceous
Microfacies
Mud mounds
Neuquén basin
Cretaceous
mud mound
sedimentary structure
Valanginian
Argentina
Palma, R.M.
Meléndez, M.N.
Calvo, J.P.
Lanés, S.G.
Biodetrital mud mounds of chachao Formation (Valanginian): Features and environmental evolution, malargüe, Mendoza
topic_facet Calcareous rocks
Chachao formation
Cretaceous
Microfacies
Mud mounds
Neuquén basin
Cretaceous
mud mound
sedimentary structure
Valanginian
Argentina
description The China Echada mud mound is a small dome-shaped structure that reaches a diameter of 5,40 m and is up to 2,5 m high. The mound consists of a non-framework net mainly composed of a large amount of micrite and fragments of infaunal pelecypods, as well as sponges, echinoderms, gastropods, serpulids and microbial crusts. Scattered remains of oysters, forams, ostracods and bryozoans are also present. The core of the mud mound is massive and homogeneous, and it is flanked by microbial crusts and pelecypods, echinoderm-rich skeletal packstone to wackestone. The small mound is embedded in a monotonous succession of well-bedded bioclastic packstone to -wackestone. The presence of homogeneous micrite and peloidal micrite suggests that the in situ accumulation and early stabilization of micrite sediments may have been favoured by microbial activity, followed by rapid marine cementation. Thallasinoides isp. on both the top and flanks of the mound provide evidence that the sedimentation was interrupted and also would indicate a low rate of sedimentation. The high amount of matrix and spicules in wackestone facies also suggests quiet and deep water conditions just below the fair weather wave base. The mound occupied the external section of a homoclinal ramp. The maximum development of its growth is related to sea level rise (transgression and early highstand), as evidenced by continuous vertical accretion and a lack of allocthonous sedimentation.
format JOUR
author Palma, R.M.
Meléndez, M.N.
Calvo, J.P.
Lanés, S.G.
author_facet Palma, R.M.
Meléndez, M.N.
Calvo, J.P.
Lanés, S.G.
author_sort Palma, R.M.
title Biodetrital mud mounds of chachao Formation (Valanginian): Features and environmental evolution, malargüe, Mendoza
title_short Biodetrital mud mounds of chachao Formation (Valanginian): Features and environmental evolution, malargüe, Mendoza
title_full Biodetrital mud mounds of chachao Formation (Valanginian): Features and environmental evolution, malargüe, Mendoza
title_fullStr Biodetrital mud mounds of chachao Formation (Valanginian): Features and environmental evolution, malargüe, Mendoza
title_full_unstemmed Biodetrital mud mounds of chachao Formation (Valanginian): Features and environmental evolution, malargüe, Mendoza
title_sort biodetrital mud mounds of chachao formation (valanginian): features and environmental evolution, malargüe, mendoza
url http://hdl.handle.net/20.500.12110/paper_00044822_v55_n4_p300_Palma
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