Extensive field work was undertaken on the island of Anjouan to try to locate sedimentary xenoliths referred to in academic papers from the late 1960’s.
An initial field trip in July identified areas of interest and geological samples were sent for petrological examination and review to the UK. The review of 8 samples identified 2 samples to be arkosic sandstones, with the remaining six igneous samples all exhibiting atypical compositions for island arc basalts. In the light of these discoveries a second field trip was undertaken in December to map the location of the sandstone occurrences. This resulted in the mapping of an area of approx. 1km by 0.8km for the sandstone xenolith. Dating of detrital Zircon crystals in the original samples by a laboratory in Canada (using single-grain laser ablation – inductively coupled plasma – mass spectrometry (LA-ICP-MS) technique) confirms the age of the Zircons to be 532.9Ma +/-4Ma. Further convincing evidence that the Comores sit atop attenuated continental crust. Following the fieldwork on Anjouan a review of beaches on Grande Comore was undertaken and resulted in finds of tar balls on a beach at N’roudé. Subsequent geochemical analysis of these finds has shown them to be lightly degraded, natural crude oil strandings.Furthermore, biomarkers have been identified which indicate the source rock origin to be Jurassic or late Triassic in age. The light degradation of the samples (i.e.they have not spent much time in the sea or on the beach) is indicative of a local origin.
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Notes to Editors:
Bahari Resources, formed in 2012, is a privately-owned oil and gas exploration company focused on Africa and the Western Indian Ocean. Founded by an experienced management team with an extensive track record in the East African petroleum exploration, the company is headquartered in Kenya.
The Union of the Comoros comprise an archipelago of islands in the Mozambique Channel of the Indian Ocean, located between Madagascar and East Africa. Receiving independence from France in 1975, the three main northern islands, Grande Comore, Anjouan, and Mohéli, comprise the Union of the Comoros, a sovereign state. The economy is based largely on agriculture, fishing and tourism and is the world’s largest producer of the essence ylang ylang.