[公告]征集各种地质现象图片(从2008-09-05起结束有奖征集) [复制链接]

方解石与沥青共生

沉积岩形貌图

开元溶洞图.

各种岩石形貌

Laminated graphitic argillite with fine-grained, graded, sphalerite-rich turbidite layers from the open pit

Large pyrite nodule within sulfide-rich graphitic argillite. The pyrite nodules show evidence of moderate to extreme deformation, indicating that they pre-date the latest deformation. Many show strong stretching that is probably related to the earliest major folding event.

Coarse, mixed fragmental unit above the COB (4200 level) containing large cherty breccia fragments with disseminated pyrite and intensely sericitized clasts. Two beige-colored fragments are altered mafic clasts.

Fe-poor sphalerite in massive chalcopyrite ores immediately above the bornite zone. The sphalerite has a distinctive silver-grey appearance, owing to its low Fe content. Late pyrite euhedra are disseminated throughout the sphalerite.

Network chalcopyrite stringers in silicified rhyolite below the bornite zone.

马里亚纳海沟