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Geometry and kinematics of brittle deformation in the Central Cameroon Shear Zone (Kékem area): implication for gold exploration within the Central Africa Fold Belt in Cameroon

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China Geology 2021年第2期4卷 245-255页

作者： De Pesquidoux i tchaptchet tchato Jacqueline Tchakounte Aurélie Ngamy Kamwa Jean Pierre Tchouankoue Soumyajit Mukherjee Department of Earth Sciences Faculty of SciencesUniversity of YaoundéIYaoundéP.O.BOX:812Cameroon Department of Mining Engineering and Minerals processing Faculty of Mines and Pretrolum IndusriesUniversity of MarouaMaroua P.O.BOX:46Cameroon Geodynamics Laboratory Department of Earth SciencesIndian Institute of Technology BombayPowaiMumbai Maharashtra 410076India

The Central Africa Fold Belt(CAFB)is a collision belt endowed with gold deposits in Eastern Cameroon area mined for about 50 ***,favorable areas for gold exploration are poorly *** paper presents(1)the kinematics of the brittle deformation in the Kékem area in the SW portion of the Central Cameroon Shear Zone and(2)constraints gold mineralization events with respect to the collisional evolution of the *** authors interpret that the conjugate ENE to E and NNW to NW trending lineament corresponds to the synthetic(R)and the antithetic(R’)shears,which accompanied the dextral slip along the NE to ENE striking *** latter coincides with the last 570-552 Ma D3 dextral simple shear-dominated transpression,which is parallel to the BétaréOya shear zone hosting gold *** mineralizations,which mainly occurred during the last dextral shearing,are disseminated within quartz veins associated to Riedel’s previous structures reactivated due to late collisional activities of the CAFB as brittle *** mineralizations occurred mainly during the 570-552 Ma D3 *** reactivation,which might be due to dextral simple shear during mylonitzation,plausibly remobilized the early gold deposits hosted in syn-compressional rocks and/or possibly focused deep-sourced fluid mixed with those released by ***,the Central Cameroon Shear Zone where Kékem is located,and which shows similar petrographical and structural features to those controling Batouri gold district,is a target area for gold exploration in Cameroon.

关键词： Gold deposit Gold mineralization Gold exploration SRTM images Riedel fractures Simple shear Congo Craton Kékem Central Africa fold belt Cameroon

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Evidence for the Upwelling of Mafic Bodies into the Upper Crust beneath the N40-50°E Branch of the Pan-African Central Cameroon Shear Zone from Gravity Studies

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Open Journal of Geology 2018年第3期8卷 278-297页

作者： Loudi Yap Robert Nouayou depesqu.dou. tchaptchet tchato Joseph Kamguia Apollinaire Bouba Department of Physics Faculty of Sciences University of Yaoundé 1 Yaoundé Cameroon Research Laboratory in Geodesy National Institute of Cartography Yaoundé Cameroon Department of Earth Sciences Faculty of Sciences University of Yaoundé 1 Yaoundé Cameroon Department of Physics Advanced Teacher’s Training College University of Maroua Maroua Cameroon

The existence of mafic bodies at mid crustal level beneath the Pan-African Central Cameroon Shear Zone is still a matter of debate. To provide additional constrains on this issue, the crust of the west region of Cameroon has been investigated using gravity data. Analyses of these data show N40-50°E oriented iso-anomal contours in the Bafoussam area, interpreted as the N40-50°E branch of the Central Cameroon Shear Zone. in addition, spectral analysis and 2.5D gravity modeling reveal intrusions of mafic bodies at depth between 3.2 and 14.2 km under N40-50°E aligned volcanic centers, namely Mt Bambouto and Mt Mbapit. The above observations suggest a structurally controlled emplacement of the mafic bodies. in the light of the recent geophysical data, the interaction between the NE-ward channel flow operating at the bottom of the lithosphere or the asthenosphere upwelling and the Cameroon Shear Zone could better explain the magma upwelling in the upper crust. This result is the novelty of the present work.

关键词： West Region Mafic Bodies Central Cameroon Shear Zone Gravity 2.5D Modelling

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Geochemistry and Geochronology of Peraluminous High-K Granitic Leucosomes of YaoundéSeries (Cameroon): Evidence for a Unique Pan-African Magmatism and Melting Event in North Equatorial Fold Belt

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international Journal of Geosciences 2012年第3期3卷 525-548页

作者： Ngnotue Timoleon Ganno Sylvestre Nzenti Jean Paul Schulz Bernhard tchaptchet tchato depesqu.dou. i Suh Cheo Emmanuel Department of Earth Sciences University of Yaoundé I P.O. Box. 3412 Messa-Yaoundé Department of Geology University of Buea P.O. Box. 63 Buea-Cameroon Department of Geology University of Dschang P.O. Box. 67 Dschang-Cameroon institut für Mineralogie TU Bergakademie Brennhausgasse 14 09596 Freiberg/Sachsen Germany

Geochemical and geochronological studies have been carry out on the leucosomes of Yaoundé series with the aims to identify the magma sources and to indicate their production periods and emplacement within the formations of the Pan-African North-Equatorial Fold Belt (PANEFB) in Cameroon. The Yaoundé series belongs to the Southern domain of the PANEFB and it is composed of migmatites in which two types of granitic leucosomes (in situ leucosomes and injected leucosomes) have been distinguished. These rocks display characteristic of calc-alkaline (in situ leucosomes) and high-K calc-alkaline to shoshonitic series (injected leucosomes). All the rocks are peraluminous with in situ leucosomes conform to S-type and injected leucosomes conform to i- and S-type granitoids. Major and trace elements composition reveal that in situ leucosomes derived from the partial melting of the host metapelite whereas injected leucosomes derived from the melting of metagreywacke. These sources are similar to those of granitoids from central and northern domains of the PANEFB. Th-U-Pb dating by electron microprobe (EMP) and LA-iCP-MS U-Pb dating on zircon have been used to constraints the melting event and emplacement of leucosomes in Yaoundé series. Th-U-Pb monazite dating, undertaken in two samples of leucosomes, gives two groups of monazite ages. The older group gives an age of 658 Ma whereas the age of younger group is 592 Ma. U-Pb dating of zircons from the leucosomes reveals a Pan-African age ranging from 626 to 654 Ma whereas zircons from metapelitic host rock reveal the overprinting of an early Pan-African event 911 - 1127 Ma on Palaeoproterozoic (2127 Ma) inheritance. These data clearly indicate that the host rocks of leucosomes of Yaoundé series have been firstly metamorphosed during Tonien-Stenien period (911 - 1127 Ma) and reveal the existence of extended unique melting event (592 and 658 Ma) in the Yaoundé series which is contemporaneous with the magmatism responsible for the emp

关键词： Pan-African North-Equatorial Fold Belt Yaoundé Series EMP Monazite Dating LA-iCP-MS U-Pb Dating Leucosomes Peraluminous Melting Event Magmatism

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Assessment of Hydraulic Parameters and Protection Zones of Catchment Aquifers for Water Supply Network in NdéDivision, West-Cameroon (Central Africa)

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Journal of Water Resource and Protection 2021年第7期13卷 478-497页

作者： Roger Feumba Kemgang Dongmo Tchouta Jean Ghislain Tabué Youmbi Valentin Yvan Emmanuel Mvondo depesqu.dou. i. tchaptchet tchato Benjamin Ngounou Ngatcha University of Yaoundé i Yaoundé Cameroon

Ndé Division in West-Cameroon is facing with water supply although many attempts of restoring existing SCANWATER facilities by Bangangté Municipality. in order to address the issue, we assess the exploitable pumping flow rate of catchment aquifers and its hydraulic properties by using Jacob and Theis method, and define protection zones with Hoffman and Lillich method. it emerges that the hydraulic conductivity of aquifer is in the order of 10-4 m/sec, transmissivity varies from 10-4 to 10-6 m2/sec. Aquifer pumping flow rate (Q) varies between 1.5 and 10.5 m3/h. in volcanic rocks, aquifer is more productive (4.5 ≤ Q ≤ 10.5 m3/h). Transfer time of pollutants to aquifer varies from 3 to 56 days depending on rock-types and groundwater slope (0.03 - 0.13 m/m). Furthermore, 113,624 m and 1123 m are radius to be implemented for a better protection of groundwater against any form of pollutant.

关键词： Pumping Tests Aquifer Properties Groundwater Protection Ndé Division West-Cameroon (Central Africa)

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Structural Relationship between Brittle Deformation and Paleozoic to Mesozoic Basalt Dykes in the Precambrian Basement of the Southern Continental Part of the Cameroon Volcanic Line

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international Journal of Geosciences 2017年第3期8卷 318-331页

作者： Nicole Armelle Wambo Simeni depesqu.dou. tchaptchet tchato Rose Noel Ngo Belnoun Jean Pierre Tchouankoue Alembert Alexandre Ganwa Department of Earth Sciences University of Ngaoundere Ngaoundere Cameroon Department of Earth Sciences University of Yaoundé I Yaoundé Cameroon

The work is a vivid description of the structural relationship between brittle deformation of the Precambrian basement in the southern continental part of the Cameroon Line and intrusive Paleozoic and Mesozoic basalt dykes swarms. A multidisciplinary approach that involves a combination of remote sensing techniques and field studies show that the major trend of brittle structures correspond to well-known regional structures: N70°E (Adamawa Shear Zone), N135°E (upper Benue trend) and N30°E (Cameroon Volcanic Line) corresponding to E-W and N-S directions respectively. Basalt dykes are associated to NE-SW, E-W and NW-SE oriented fractures. An integration of the available information on brittle structures and basalt dykes directions suggest an emplacement of the Mesozoic and Paleozoic basalt dykes structurally controlled by Precambrian structures that were originated through Riedel’s fracture kinematic model with dextral strike-slip Adamawa Shear Zone as the main shear zone during late stage of the Pan-African collision. Spatially, the restriction of the basalt dykes to the corridor of the Adamawa Shear Zone indicate that a rejuvenation of Precambrian faults may very well be the origin of the dykes with possibility that they may have been reworked several times during the Phanerozoic eon.

关键词： Basalt Dykes Brittle Tectonics Adamawa Shear Zone Riedel Model Western Gondwana

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