变质砾岩

变质砾岩（英语：metaconglomerate）是砾岩经过变质作用后形成的岩石类型。砾岩是由卵石或较大的碎屑颗粒和基质组成，其基质为沙、淤泥或黏土。变质砾岩与砾岩组成相似，但其碎屑颗粒会经过变质而变形。砾岩的基质固结不如其碎屑颗粒，因此当破碎时，砾岩中的碎屑颗粒会从基质破裂而出。然而，变质砾岩破碎时其碎屑颗粒和基质会同时破裂，因其基质已经变质重结晶^[1]。

变质砾岩有时呈叶片状，其生成变质环境与板岩或千枚岩相同，但母岩（原岩）是砾岩，而不是黏土^[2]。

西澳大利亚杰克山的变质砾岩是碎屑锆石的源岩，这些碎屑锆石的历史可追溯至44亿年^[3]^[4]。

参考文献

^ Metaconglomerate
^ Essentials of Geology, 3rd Ed, Stephen Marshak
^ VALLEY, John W.1, CAVOSIE, A.J., WILDE, S.A., GRANT, M., and LIU, Dunyi, JACK HILLS METACONGLOMERATE: EVIDENCE OF EARLY AND LATE ARCHEAN HYDROSPHERE, The Geological Society of America, 2002 Denver Annual Meeting http://gsa.confex.com/gsa/2002AM/finalprogram/abstract_39602.htm
^ ftp://rock.geosociety.org/pub/reposit/2002/2002034.pdf from: Peck, W.H., Valley, J.W., Wilde, S.A., and Graham, C.M., 2001, Oxygen isotope ratios and rare earth elements in 3.3 to 4.4 ga zircons: Ion microprobe evidence for high δ18O continental crust in the early Archean: Geochimica et Cosmochimica Acta, v. 65, p. 4215-4229.

[”Meta”-1] Metaconglomerate

[”Esse”-2] Essentials of Geology, 3rd Ed, Stephen Marshak

[”VALLEY”-3] VALLEY, John W.1, CAVOSIE, A.J., WILDE, S.A., GRANT, M., and LIU, Dunyi, JACK HILLS METACONGLOMERATE: EVIDENCE OF EARLY AND LATE ARCHEAN HYDROSPHERE, The Geological Society of America, 2002 Denver Annual Meeting http://gsa.confex.com/gsa/2002AM/finalprogram/abstract_39602.htm

[”ftp:”-4] tp://rock.geosociety.org/pub/reposit/2002/2002034.pdf from: Peck, W.H., Valley, J.W., Wilde, S.A., and Graham, C.M., 2001, Oxygen isotope ratios and rare earth elements in 3.3 to 4.4 ga zircons: Ion microprobe evidence for high δ18O continental crust in the early Archean: Geochimica et Cosmochimica Acta, v. 65, p. 4215-4229.

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