Origin of Dinantian zebra dolomites south of the Brabant-Wales Massif, Belgium

• Main Authors: Nielsen, P, Swennen, Rudy, Muchez, Philippe, Keppens, E
• Format: Article in Journal/Newspaper
• Language: English
• Published: Blackwell science ltd 1998
• Subjects: zn-pb deposit; baffin-island; saddle dolomite; ag deposit; canada; nanisivik; networks; textures; example; carbon; Baffin Island; Brabant; Canada; Nanisivik; Baffin
• Online Access: https://lirias.kuleuven.be/handle/123456789/62292; http://gateway.newisiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=CCC&SrcApp=PRODUCT_NAME&SrcURL=WOS_RETURN_URL&CKEY=NIEL0727980045SP&DestLinkType=FullRecord&DestApp=CCC&SrcDesc=RETURN_ALT_TEXT&SrcAppSID=APP_SID

Zebra dolomites, characterized by a repetition of dark grey (a) and light (b) coloured dolomite sheets building up abbabba-sequences, occur in Dinantian strata from deep boreholes (> 2000 m) south of the Brabant-Wales Massif in Belgium. These zebra dolomite sequences are several tens of metres thick. The dark grey dolomite sheets (a) consist of non-planar crystals, 80-150 mu m in diameter. These crystals display a mottled red-orange luminescence and are interpreted to be replacive in origin. The white dolomite sheets (b) consist of coarse crystalline nonplanar b(1) dolomite, which evolves outwards into transparent saddle shaped b(2) dolomite. The b(1) dolomites possess a mottled red-orange luminescence similar to the a dolomites, while the saddle shaped bz rims display red to dark brown luminescent-zones, The b(1) dolomites are possibly partly replacive and partly cavity filling. Their b2 rims display criteria typical for a cement origin. Locally, cavities exist between two succeeding white dolomite sheets. These cavities make up approximate to 5% of the zebra rocks and are locally filled by saddle shaped ankerite and/or xenomorphic ferroan calcite. status: published