海相黑色页岩中一种动物型的有机显微组分

传统煤岩学主要研究腐殖型的有机显微组分,关于海相腐泥型的有机显微组分及其与成煤、成油(气)、成矿的关系在以往的文献中较少报道.作者在对早古生代海相腐泥型有机显微组分的研究中,发现了一种特殊的有机显微组分.经过对这种组分生源的追查和化石的鉴定表明,这种组分来源于被囊动物化石尾海鞘的“房”稍—被囊,因此把这种组分归之为动物型的有机显微组分,命名为“被囊体”.这种组分是追索被囊动物化石的线索,具有重要的地质找矿意义.

A KIND OF ANIMAL MACERAL IN MARINE BLACK SHALE

The main objective of petrological research on coal is the maceral of humus type. Reports on marine sapropel type maceral and the relations between the maceral and the geneses of coal,oil/gas and ore deposits are few in literature.The author discovers a special sapropel type maceral in Early Palaeozoic Era.It has a clear and peculiar contour. It is homogenous, structureless, with cleats caused by contraction of colloid dehydration. The character of the maceral resembles chemically that of the cellulose which is typical of the plant population.It differs from vitrinite by its special form colloid feature, though resembles vitrinitc in nature.It also differs from alginite by its clear contour and being structureless, though it resembles alginite in chemical components. It always associates with alginite, and occurs in the vanadium ore. Investigating the organism association in the black shale is the key to ascertaining tha bio-source of this kind of maceral. The author discovers the "house" (an organicoat) of fossil appen-dicularian of tunicate and provides the direct evidence of the bio-source of this kind of maceral. The remains of fossil appendicularians are unmistakably the material of the maceral, which may be classified into the animal type and named as "tunicate" . Tunicate is not only the mark of the existence of fossil tunicates, but also the clue to the origin of chordata before the Cambrian, as well as to the tracing of fossil tunicates in the strata after the Cambrian, Tunicate is an indicator in metallogeny a,nd exploration of the marine combustible organic deposits and the black shale type vanadium deposits.