THE ORIGIN OF THE SUBSURFACE IGNEOUS CLASTICS ACCUMULATION IN AL-TINIF VICINITY, WEST IRAQ, A NEW CONCEPT

Abstract

The presence or otherwise of a shallow igneous intrusive body and the origin of the igneous clastics accumulation in Al-Tinif (Al-Waleed) vicinity is a matter of controversy. Many authors conducted different types of geophysical, geochemical and petrographical studies; some of them were associated with drilling. None of the ten drilled boreholes, to maximum depth of 193m, struck an igneous body. The extracted cores from these boreholes indicate inhomogeneous materials including breccia, sand grains and rounded, altered basalt pebbles. Petrographic studies showed cyclic graded bedding sediments with fining upwards nature. Geophysical studies showed major positive anomaly surrounded by negative anomalies. Two scenarios are assumed in this study, the first one (depends on the previous works) is the assumption of presence of an igneous body with arguments, whereas the second scenario deals with the absence of an igneous body. Many indications are given to support the second scenario.