Study of Rift-Induced Diamond Diatremes in NW Syria

含金刚石金伯利岩与稳定的 太古宙的钾镁煌斑岩，而含金刚石的橄榄石钾镁煌斑岩则是 侵入相邻的移动的带。 然而，一个新发现的 叙利亚西北部的钻石矿与这两种情况都不同。 成簇的裂谷诱导含金刚石喷发物进入侏罗纪 叙利亚地堑西部地块的岩石年代为 1.1 - 1.15亿年，与中生代的再生事件相似， 南部、西部和东部非洲、巴西、北美， 西伯利亚 叙利亚的钻石主岩既不是金伯利岩， 但也有一些接近于埃斯库森的成分 贝桑石。 未风化的岩芯样品是外来的多金属化合物， 含蛇纹岩、玻璃和矿物的火山角砾岩 碎片嵌在碳酸盐基质中 上地幔源 捕虏体为石榴二辉橄榄岩、纯橄榄岩和离散巨晶 由钛铁矿透辉石和石榴石组成 地壳捕虏体为石榴石 麻粒岩、辉长岩和角闪岩。 南北叙利亚地堑是东非的延伸， 埃塞俄比亚、阿法尔、红海和死海裂谷系， 至少从侏罗纪开始就一直活跃着 古金伯利岩的裂谷诱发碱性岩浆取样或 预先存在的管道中的钾镁煌斑岩是一种可能的模型， 非脆金刚石母岩的生成 叙利亚西北部的阿拉伯板块。 这种不寻常的构造环境和混合体的异国情调 钻石主岩是本提案的重点。 体积和 矿物化学和稳定同位素技术将应用于 测试杂交模型，或者替代地建立 这些确实是上地幔内部的原始熔融产物 钻石的稳定性

Diamondiferous kimberlites are closely associated with stable Archean cratons, whereas diamond=bearing olivine lamproites are intruded into adjacent mobile belts. However, a newly discovered diamond field in NW Syria differs from both these settings. Clusters of rift-induced diamond-bearing eruptives into Jurassic dolomites of the western block of the Syria Graben are dated at 110-115 m.y., similar in age to the Mesozoic reuptive event in southern, west and east Africa, brazil, North America, and Siberia. Diamond host rocks in syria are neither kimberlites nor lamproites, but some approach the composition of essexite or basanite. Samples of unweathered drill cores are exotic polymict volcanoclastic breccias with serpeintine, glass and mineral fragments set in a carbonate matrix. Upper mantle-derived xenoliths are garnet lherzolite, dunite and discrete megacrysts of ilmenite, diopside, and garnet. Crustal xenoliths are garnet granulites, gabbros, and amphibolites. The N-S Syria Graben is an extension of the East African, Ethiopian, Afar, Red Sea and Dead Sea Rift systems, parts of which have been continuously active since at least the Jurassic. Rift-induced alkali magmatic sampling of paleo-kimberlites or lamproites in pre-existing conduits is one possible model for the generation of the non-trrditional diamond host rocks in the Arabian Plate of NW Syria. This unusual tectonic setting and the exotic nature of the hybrid diamond host rocks is the focus of this proposal. Bulk and mineral chemical and stable isotope techniques will be applied to test the hybridization model, or alternatively to establish that these are indeed primary upper mantle melt products from within the diamond stability field.