Skip to Main Content
Skip Nav Destination
GEOREF RECORD

The Lomati Delta Complex; a prograding tidal delta in the Archean Moodies Group, Barberton greenstone belt

L. Stutenbecker, C. Heubeck and A. Zeh
The Lomati Delta Complex; a prograding tidal delta in the Archean Moodies Group, Barberton greenstone belt
South African Journal of Geology (January 2019) 122 (1): 17-38

Abstract

Archean terrestrial-marine transitional strata provide insights in early-Earth coastal-zone dynamics and the onset of land colonization but are exceedingly rare. We here present results of detailed mapping, stratigraphic and petrographic analysis, and age dating of the Lomati Delta Complex, a morphologically prominent, wedge-shaped and dominantly arenaceous unit in the middle Moodies Group ( approximately 3.22 Ga) of the central Barberton Greenstone Belt (BGB). Subvertical regional bedding allows cross-sectional correlation within a prograding delta complex from proximal coarse-grained coastal-plain-facies sandstones to stratigraphically equivalent fine-grained and rhythmic prodelta siltstones over ca. 7 km strike length. Several reworked, subaerially exposed delta-top units mark sudden flooding events preceding progradational pulses. Microbial mats densely colonize shallow-marine facies. The provenance of detrital zircon grains and the feldspathic character of the sediments point to a proximal source comprising magmatic rocks formed mainly at 3.24, 3.28, 3.43 and 3.54 Ga within the BGB. The Lomati Delta Complex likely formed in a narrow, tide-dominated basin in which sedimentary systems quickly responded to changes in basin geometry, nearby source region uplift, and sediment supply.


ISSN: 1012-0750
EISSN: 1996-8590
Serial Title: South African Journal of Geology
Serial Volume: 122
Serial Issue: 1
Title: The Lomati Delta Complex; a prograding tidal delta in the Archean Moodies Group, Barberton greenstone belt
Affiliation: Technische Universitaet Darmstadt, Institute of Applied Geosciences, Darmstadt, Germany
Pages: 17-38
Published: 20190101
Text Language: English
Publisher: Bureau for Scientific Publications, Pretoria, South Africa
References: 101
Accession Number: 2019-012052
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, geol. sketch maps
S27°00'00" - S18°00'00", E18°00'00" - E30°00'00"
Secondary Affiliation: Friedrich-Schiller-Universitaet Jena, DEU, GermanyKarlsruhe Institute of Technology, DEU, Germany
Country of Publication: South Africa
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, Copyright, Geological Society of South Africa. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201909
Close Modal

or Create an Account

Close Modal
Close Modal