檢視煤深成变质作用的原始碼

[[File:煤深成变质作用.jpg|缩略图|[https://image.baidu.com/search/detail?ct=503316480&z=0&ipn=d&word=%E7%85%A4%E6%B7%B1%E6%88%90%E5%8F%98%E8%B4%A8%E4%BD%9C%E7%94%A8&step_word=&hs=0&pn=26&spn=0&di=1440&pi=0&rn=1&tn=baiduimagedetail&is=0%2C0&istype=0&ie=utf-8&oe=utf-8&in=&cl=2&lm=-1&st=undefined&cs=2541337294%2C1252534912&os=417533432%2C3457710740&simid=3428863589%2C515793065&adpicid=0&lpn=0&ln=1092&fr=&fmq=1624053699718_R&fm=&ic=undefined&s=undefined&hd=undefined&latest=undefined&copyright=undefined&se=&sme=&tab=0&width=undefined&height=undefined&face=undefined&ist=&jit=&cg=&bdtype=15&oriquery=&objurl=https%3A%2F%2Fgimg2.baidu.com%2Fimage_search%2Fsrc%3Dhttp%3A%2F%2Fgss0.baidu.com%2F7Po3dSag_xI4khGko9WTAnF6hhy%2Fzhidao%2Fpic%2Fitem%2Fd000baa1cd11728bf083bb77c5fcc3cec3fd2c3c.jpg%26refer%3Dhttp%3A%2F%2Fgss0.baidu.com%26app%3D2002%26size%3Df9999%2C10000%26q%3Da80%26n%3D0%26g%3D0n%26fmt%3Djpeg%3Fsec%3D1626645516%26t%3D570c2f873cd4d39c91bb166e89201fe3&fromurl=ippr_z2C%24qAzdH3FAzdH3Fzit1w5_z%26e3Bkwt17_z%26e3Bv54AzdH3Fq7jfpt5gAzdH3F9nclmlb9_z%26e3Bip4s&gsm=1b&rpstart=0&rpnum=0&islist=&querylist=&nojc=undefined 原图链接][https://zhidao.baidu.com/question/43596984.html 来自百度知道]]]
'''煤深成变质作用'''地面下较深处的煤，在正常地温和上覆岩系静压力的影响下发生的变质作用。煤深成变质作用在各种煤变质类型中对煤影响范围最广，具有普遍性，又称煤区域变质作用。由于它主要是以地温为热源，因而亦称煤地热变质作用或煤正常变质作用。