| 제 2 장. Mineralogy | ||||||||||
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(1) Terrigenous - quartz, feldspar, rock fragments, clay minerals, heavy minerals. * provenance - source rock composition 반영 → kyanite, staurolite (변성암기원) tectonic terranes 추정(Ingersoll : 1983) → Great Valley Basin 연구로 잘 알려짐 Potassium feldspar → granite 기원 (2) Chemical and miscellaneous sediment - biogenic - micrite, skeletal - aragonite, calcite, high-Mg calcite
- pyroclastic - tephra (화산분출 모든물질)
== physico-chemical - evaporites, chert(volcanic-origin), zeolite. phosphates, non-skeletal carbonates.
- pellet - sand-sized aggregates
- ooids - medium-coars sand sized, shallow - intertidal 환경
- phosphates - replacement of carbonate particles
- chert - microcrystalline, cavity-filling (fibroradiating) chert
- zeolite - hydrous aluminosilicates. volcanic origin
- Fe-rich sediments - banded, cherty Precambrian formations. (3) Cementation - silica, carbonate Silica : deep diagenesis : microcrystalline chert, fibrous chert(chalcedony) hydrous form(opal), overgrowth Carbonate : CaCO3, provided by ground water Siderite (FeCO3) Iron Oxide (hematite) ** Volcaniclastic - 화산기원 모든 sediments Pyroclasitc - 특별히 화산폭발에 의해 직접 분출 생성된 물질만을 지칭
* accretionery lapilli → 성장력 Volcaniclastic 의 3 types deposits ① pyroclastic - fall deposits → air fall, block, bomb ② volcaniclastic flow deposits → ignimbites (fludized ash flow) base-surge deposits (ash-laden steam flow) lahar deposits - mud flow ③ hyaloclastite → fragmented and granulated lava through water-contact (수성기원 응회암) : 수중분출, 빙하주변 용암 분출 시 생성
(4) Classification Folk's classification - sandstone
Mudrock
Carbonate - Dunham's : mudstone → wackestone → packstone → grainstone → boundstone 10%〉mud-supported 10%〈 grain-supported no mud - Folk's : - allochem → intraclast Ooid fossil pellet - orthochem - micrite, sparite(cement) - reef rock
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제1장. 퇴적물 및 퇴적암의 일반적인 성질 |
