( 3 ) jianchaling ultrabasic intrusion belongs to magnesian ultrabasic simple rock - body , close related with yangzi block in space , which formed in the interim of proterozoic active tectonic zone to phanerozoic orgenic belt ( 3 )证实煎茶岭超基性岩体为含铁的镁质超基性单式岩体,空间上与扬子地块关系密切,形成于新元古代由元古宙活动带向显生宙造山带过渡时期。