中国大陆科学钻探孔区深层含金红石榴辉岩矿体

Deeply buried rutile-bearing eclogite bodies at the site of the Chinese Continental Scientific Drilling Hole

利用大陆科学钻探岩心、岩心物性测定结果、测井与VSP资料来标定地震反射体,大大提高了中国大陆科学钻探孔区地质构造解释的可信度。岩石物性测定表明,金红石榴辉岩的纵波速度极高,会产生明显的反射与重力异常。数值模拟表明,孔区三维地震拱形反射主要是由榴辉岩及切穿它们的晚期破碎带共同形成的。在CCSD主孔东南方深部重力高部位有多个这样的拱形反射,预示在地表陡倾榴辉岩的延伸方向还有多个一定规模的隐伏榴辉岩体。

The cores, measurements of physical properties, well-logging and VSP data obtained from the Chinese Continental Scientific Drilling （CA2SD） hole can be used to calibrate seismic reflectors and raise the reliability of .seismic interpretation. Measurements of physical properties indicate that the rutile-bearing eclogite, due to its very high seismic velocity and density, can produce reflections and gravity anomalies. Numerical modeling demonstrates that the arch reflectors appearing at the CCSD site result jointly from the eclogites and the penetrating late shatter zone. Southeast of the CCSD main hole, there are quite a few such reflectors, implying that eclogite bodies exist in the extension direction of the surface eclogite body.