P-T-t轨迹的概念 北秦岭变质岩系的p-T-t轨迹
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1.p-T\u8f68\u8ff9\u7ecf\u5386\u7b49\u538b\u5347\u6e29\u2192\u964d\u538b\u5347\u6e29\u2192\u7b49\u6e29\u964d\u538b\u2192\u964d\u538b\u964d\u6e29\u8f83\u957f\u7684\u6bd4\u8f83\u5b8c\u6574\u7684\u6f14\u5316\u8fc7\u7a0b\u3002\u4e0eEngland\u7b49\uff081984\uff09\u63d0\u51fa\u7684\u4e0d\u540c\u6784\u9020\u4f5c\u7528\u6240\u4ea7\u751f\u7684p-T\u8f68\u8ff9\u56fe\u793a\u6bd4\u8f83\uff0c\u4e0a\u8ff0p-T-t\u8f68\u8ff9\u53cd\u6620\u7684\u662f\u9646\u58f3\u56e0\u9006\u51b2\uff0c\u589e\u539a\u6216\u5747\u2014\u589e\u539a\u3002\u9006\u51b2\u4f7f\u5730\u58f3\u5728\u4f4e\u6e29\u6761\u4ef6\u4e0b\u88ab\u8fc5\u901f\u589e\u538b\uff0c\u968f\u7740\u5ca9\u77f3\u8fdb\u5165\u5730\u58f3\u6df1\u90e8\uff0c\u5c31\u4f1a\u7ecf\u5386\u4e00\u822c\u52a0\u70ed\u671f\uff0c\u8fd9\u6bb5\u65f6\u95f4\u53ef\u4ee5\u538b\u529b\u65e0\u751a\u5927\u7684\u53d8\u5316\uff0c\u800c\u6e29\u5ea6\u53ef\u4ee5\u53d1\u751f\u8f83\u5927\u7684\u589e\u503c\u3002\u52a0\u70ed\u6548\u5e94\u4f7f\u5e94\u529b\u677e\u9a70\uff0c\u5747\u8861\u4f5c\u7528\u4f7f\u5730\u8d28\u4f53\u6574\u4f53\u62ac\u5347\u800c\u88ab\u5265\u8680\u3002\u56e0\u800c\u8fdb\u5165\u7b49\u6e29\u964d\u538b\u548c\u51cf\u6e29\u51cf\u538b\u7684p-T\u6f14\u5316\u8fc7\u7a0b\u3002
2.\u5728\u5230\u8fbe\u6700\u9ad8\u6e29\u5ea6\uff08Tmax\uff09\u4e4b\u524d\uff0cp-T\u8f68\u8ff9\u663e\u793a\u7b49\u538b\u52a0\u6e29\u2192\u964d\u538b\u5347\u6e29\u2192\u663e\u793a\u521d\u6b65\u7b49\u6e29\u538b\u7684\u7279\u5f81\u3002p-T\u8f68\u8ff9\u7684Tmax\u7684\u65f6\u95f4\u53ef\u5927\u81f4\u7531\u9a6c\u5c71\u53e3\u5730\u533a\u84dd\u6676\u77f3\uff08sil\uff09\uff0d\u5915\u7ebf\u77f3\uff08kfs\uff09\u5e26\u4e2d990.68\u00b10.39Ma\u7684Rb-Sr\u7b49\u65f6\u7ebf\u5e74\u9f84\u9650\u5236\u3002\u8868\u660e\u5143\u53e4\u5b99\u65e9\u671f\u7684\u6784\u9020\u52a8\u529b\u4f7f\u79e6\u5cad\u5ca9\u7fa4\u5728\u5730\u58f3\u4e2d\u6df1\u57cb\u8fbe35km\u4ee5\u4e0b\uff0c\u5e76\u5728\u8be5\u6df1\u5ea6\u4e0a\u5728\u5730\u5e54\u9686\u8d77\u53ca\u5176\u70ed\u6d41\u7684\u5f71\u54cd\u4e0b\uff0c\u7ecf\u5386\u4e86\u4e00\u6bb5\u7b49\u538b\u52a0\u6e29\u8fc7\u7a0b\uff1b\u5728\u5730\u58f3\u6df1\u90e8\u53d1\u751f\u7684\u8131\u6c34\u53cd\u5e94\u548c\u8131\u78b3\u9178\u5ca9\u5316\u53cd\u5e94\u53ef\u4ee5\u6790\u51faH2O\u548cCO2\uff0c\u5e76\u4e0e\u53d8\u8d28\u5206\u5f02\u7684SiO2\u6210\u5206\u901a\u8fc7\u4e0a\u8986\u5ca9\u77f3\u5411\u4e0a\u6e17\u900f\uff0c\u96c6\u4e2d\u5728\u6811\u679d\u72b6\u901a\u9053\u5185\u5f62\u6210\u79e6\u5cad\u5ca9\u7fa4\u53d1\u80b2\u7684\u7f51\u72b6\u77f3\u82f1\u8109\u4f53\u548c\u78b3\u9178\u76d0\u8109\u4f53\uff1b\u5728\u5747\u8861\u6548\u5e94\u4f5c\u7528\u4e0b\u53d1\u751f\u62ac\u5347\u4f5c\u7528\u7684\u540c\u65f6\uff0c\u4ecd\u53d7\u5230\u52a0\u70ed\u6548\u5e94\u5e76\u4f7f\u6e29\u5ea6\u8fbe\u5230\u6700\u5927\u503c\uff08Tmax\uff09\u3002\u4e4b\u540e\u8fdb\u5165\u65b0\u5143\u53e4\u4ee3\u5373\u664b\u5b81\u671f\u6f14\u5316\u9636\u6bb5\u3002
\u56fe5-9\u3000\u533a\u57df\u53d8\u8d28\u7684p-T\u4f53\u5236
A\u2014\u79e6\u5cad\u7fa4\uff08\u636e\u9648\u80fd\u677e\u7b49\uff09\uff1bB\u2014\u5317\u5bbd\u576a\u5bbd\u576a\u7fa4\uff08\u8d75\u5b50\u7136\uff09\uff1bB\u2032\u2014\u4e54\u7aef\u5bbd\u576a\u7fa4\uff08\u672c\u6587\uff09\uff1bC\u2014\u4e8c\u90ce\u576a\u7fa4\uff08\u738b\u4ec1\u6c11\uff09
3.990.68\u00b10.39Ma\u4ee5\u540e\u7684p-T\u8f68\u8ff9\u4e3b\u8981\u53cd\u6620\u79e6\u5cad\u5ca9\u7fa4\u5185\u7b49\u6e29\u964d\u538b\u2192\u964d\u6e29\u964d\u538b\u7684\u8fc7\u7a0b\u3002\u201c\u53d8\u8d28\u9876\u5cf0\u201d\u4ee5\u540e\u7684\u964d\u6e29\u51cf\u538b\u8fc7\u7a0b\uff0c\u4e00\u822c\u53cd\u6620\u9020\u5c71\u5e26\u7684\u8936\u76b1\u9686\u8d77\u3001\u98ce\u5316\u5265\u8680\u7684\u201c\u9000\u53d8\u8d28\u201d\u5386\u53f2\uff08F.S.Spear,1984\uff09\u3002p-T\u8f68\u8ff9\u5927\u90e8\u5206\u6bb5\u843d\u8fdb\u5165\u84dd\u6676\u77f3\uff0d\u5915\u7ebf\u77f3\u76f8\u7cfb\u5185\uff0c\u57fa\u672c\u53cd\u6620\u53d8\u8d28\u4f5c\u7528\u53d1\u751f\u5728\u201c\u84dd\u6676\u77f3\uff0d\u5915\u7ebf\u77f3\u76f8\u7cfb\u201d\uff0c\u5730\u6e29\u68af\u5ea6\u5f88\u4f4e\u6216\u964d\u538b\u8fc5\u901f\u53ca\u53cd\u6620\u5265\u8680\u4f5c\u7528\u5341\u5206\u8fc5\u901f\u7684\u60c5\u51b5\uff0c\u4e00\u822c\u53cd\u6620\u7684\u662f\u78b0\u649e\u9020\u5c71\u4f5c\u7528\uff08England\u548cThompson,1984\uff09\u3002
4.p-T\u8f68\u8ff9\u5728p=1.02GPa\u3001T=600\u2103\u5904\u4e0e\u6ce5\u8d28\u5ca9\u7684\u521d\u7194\u7ebf\u76f8\u4ea4\uff0c\u53c8\u5206\u522b\u5728p=0.998GPa\u3001T=650C\u548cp=0.8GPa\u3001T=710\u2103\u5904\u8d8a\u8fc7\u89d2\u95ea\u5ca9\u76f8\u521d\u7194\u6027\u548c\u6ce5\u8d28\u5ca9\u7684\u5e72\u7194\u878d\u7ebf\u3002\u8bf4\u660e\u5728\u5143\u53e4\u5b99\u664b\u5b81\u8fd0\u52a8\u671f\u95f4\u533a\u57df\u53d8\u8d28\u4f5c\u7528\u53d1\u751f\u90e8\u5206\u7194\u878d\u4f5c\u7528\u7684\u53ef\u80fd\u6027\u3002\u533a\u57df\u4e0a\u53d1\u80b2\u7684\u5fb7\u6cb3\uff08t=793\u00b130Ma\uff09\u7b49\u4fb5\u4f4d\u4e8e\u79e6\u5cad\u5ca9\u7fa4\u4e2d\u7684\u82b1\u5c97\u5ca9\u4f53\u53ef\u80fd\u662f\u8fd9\u79cd\u6ce5\u8d28\u5ca9\u90e8\u5206\u7194\u878d\u7684\u4ea7\u7269\u3002
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P-T-t轨迹（P-T-tpath）就是“岩石在变质作用过程中P-T条件随时间（t）的变化而变化的历程（course）”（Miyashiro,1994）。这一概念最早是England＆ Richardson（1977）在一篇论述侵蚀作用对造山带区域变质作用演化过程的影响的论文中提出的，当初称作P-T轨迹（P-T path）。P-T-t轨迹概念的提出，是变质作用理论研究的重大突破，它使得人们用动态的观点，重新审视变质岩岩石学领域的一些重大问题和基本概念。标志着变质作用研究进入地球动力学（geodynamics）阶段的里程碑。
变质地体的热模拟和变质岩经历的P-T-t轨迹、热演化及构造演化之间的关系研究成果表明，岩石经历的实际P-T-t轨迹的特点与变质作用构造环境密切相关。下面以大陆碰撞造山带为例，介绍P-T-t轨迹与构造－热演化过程的关系及有关基本概念。
绛旓細鎵璋揚-T-t杞ㄨ抗(P-T-t path)灏辨槸鈥滃博鐭冲湪鍙樿川浣滅敤杩囩▼涓璓-T鏉′欢闅忔椂闂(t)鐨勫彉鍖栬屽彉鍖栫殑鍘嗙▼(course)鎴栧湪P-T鍥捐В涓〃绀鸿鍘嗙▼鐨勬洸绾库(Miyashiro,1994)銆傝繖涓姒傚康鏄1977骞碋ngland鍜孯ichardson鍦ㄤ竴绡囪杩颁镜铓浣滅敤瀵归犲北甯﹀尯鍩熷彉璐ㄤ綔鐢ㄦ紨鍖栬繃绋嬬殑褰卞搷鐨勮鏂囦腑鎻愬嚭鐨,褰撳垵绉颁綔P-T杞ㄨ抗(P-T path)銆備互鍚,England鍜...
绛旓細涔旂瀹藉潽宀╃兢鐨p-T杞ㄨ抗锛圔鈥诧級鐨勫熀鏈壒寰佷粎浠呭弽鏄犱簡鍗囨俯銆佸崌鍘嬬殑杩囩▼銆傚晢宸炲鍧博缇や笌涔旂瀹藉潽宀╃兢p-T杞ㄨ抗鐗瑰緛鐨勫熀鏈樊寮傛湁涓ょ偣锛氣憼浠呭晢宸炲寳瀹藉潽鐨勫鍧博缇ゅ嚭鐜版櫄鏈熺殑闄嶅帇杩囩▼锛涒憽鍟嗗窞瀹藉潽宀╃兢鏃犺鏄棭鏈熺殑鍗囨俯鍗囧帇杩囩▼锛岃繕鏄櫄鏈熺殑鍗囨俯闄嶅帇杩囩▼锛岄兘浣撶幇涓哄叿鐩稿杈冮珮鐨勫湴娓╂搴﹁儗鏅紝鑰屼箶绔鍧博缇ょ殑...
绛旓細鏄剧劧锛宲-T-t杞ㄨ抗鐮旂┒姝ｆ紨涓庡弽婕旂浉缁撳悎锛屽博鐭冲鐮旂┒涓庣儹妯℃嫙鐩哥粨鍚堬紝鏄彁楂樼儹妯℃嫙鍜宲-T-t杞ㄨ抗鐮旂┒姝ｇ‘鎬х殑閲嶈閫斿緞銆傗憿鍦╬-T-t杞ㄨ抗鐮旂┒杩囩▼涓紝搴旈噸瑙嗗彉璐ㄧ熆鐗╃殑鎴愬垎鐜甫銆佸彉璐ㄧ熆鐗╀腑鐨勬祦浣撳寘瑁逛綋銆佸悓浣嶇礌骞翠唬瀛﹁祫鏂欏拰鍚勭鐭跨墿涓嶅悓灏侀棴娓╁害绛夊洜绱犮傚綋鐒讹紝鍙樿川浣滅敤p-T-t杞ㄨ抗鐨勭爺绌跺湪鐩墠浠庢蹇靛埌鏂规硶閮...
绛旓細80骞翠唬鍑虹幇鐨刾-T-t杞ㄨ抗鐮旂┒鏂规硶,瀹冨皢鍙樿川浣滅敤鐨刾銆乀鏉′欢涓庢椂闂村洜绱犺仈绯昏捣鏉,璁ㄨ鍙樿川杩囩▼涓殑鍦扮儹鍜屾瀯閫犺儗鏅殑鍙樺寲,鍙互璇存槸鍦板涓婄殑涓澶ц繘灞曘備互鐭跨墿缁勫悎鐮旂┒鍙樿川宀╃殑p銆乀鏉′欢鏄竴绉嶄紶缁熸柟娉曘傜熆鐗╃粍鍚堣〃鐜扮殑椤跺嘲娓╁帇浣滅敤涓庣熆鐗╁寲瀛︾幆甯﹁褰曠殑鐩稿杩炵画鐨勫尯鍩熷彉璐ㄤ綔鐢ㄧ殑鍔ㄦ佽繃绋嬪簲璇ュ瓨鍦ㄧ潃鏌愮褰㈠紡鐨勫伓鍚堝叧绯汇傛澶栧彉璐...
绛旓細锛1锛夊氨鏅亶鐨勮璇嗚岃█锛鍙樿川浣滅敤P-T杞ㄨ抗鏄寚鍦板３涓煇涓鐐圭殑宀╃煶浠庤繘鍏ヤ腑銆佷笅鍦板３鐒跺悗鍐嶉殕鍗囧埌鍦拌〃鎵閬彈鐨勫彉璐ㄤ綔鐢ㄧ殑鍏ㄨ繃绋嬨傚缓绔婸-T杞ㄨ抗鍩烘湰鏂规硶闄や笂杩板埄鐢ㄥ彉璐ㄥ博鐭充腑鍙樿川鐭跨墿銆佺熆鐗╃粍鍚堢殑婕斿寲瑙勫緥鍜屽彉璐ㄥ弽搴旂粨鏋勭殑鈥滃弽婕旀硶鈥濆锛岃繕鍙互鍦ㄨ瀹氫竴瀹氱殑杩愬姩瀛︽ā鍨嬪拰鐑弬鏁扮殑鍩虹涓婇氳繃鏁板妯℃嫙鈥滄婕斺濊...
绛旓細鍦ㄨ繖绉嶈儗鏅笅锛孍ngland 锛 Richardson ( 1977) 鎻愬嚭鍙樿川浣滅敤 鈥淧 锛 T 閫斿緞鈥濈殑姒傚康銆傚悗鏉ngland 锛 Thompson ( 1984) 鍙堝闄嗗３纰版挒甯﹀ぇ闄嗗鍘氫簨浠朵腑鍖哄煙鍙樿川浣滅敤鐨 P 锛 T 婕斿寲瑙勫緥杩涜浜嗘洿鍏ㄩ潰鐨勭儹妯℃嫙锛屽悓鏃跺紑灞曚簡鐭跨墿缁勫悎鍙樺寲瑙勫緥鐨勭爺绌讹紝骞舵寮忓紩鍏 鈥滃彉璐ㄤ綔鐢 PTt 杞ㄨ抗 ( Metamorphic PTt ...
绛旓細鍥12-23鐧诲皝宀╃兢鍙樿川鍙樺舰P-T-t杞ㄨ抗鐨鍦扮悆鍔ㄥ姏瀛﹁В閲婂彲浣滃涓嬬畝瑕佹弿杩帮紝璇ヨ建杩瑰彲鍒嗕负涓ゆ锛屼竴娈典互闄嶅帇涓轰富鍐峰嵈鏋佺紦鎱紝鍙︿竴娈靛垯涓鸿繎绛夊帇鐨勫喎鍗达紝鏁翠釜杩囩▼鍧囧彂鐢熶簬钃濇櫠鐭崇ǔ瀹氬尯銆傛暣浣撲负闄嶅帇鍚庣殑鍐峰嵈銆傝杞ㄨ抗涓洪『鏃堕拡鍨嬶紝浠庤岃〃鏄庡畠涓庨檰澹充細鑱氱鎾炵幆澧冨瘑鍒囩浉鍏炽傚浘12-23銆鏂板お鍙や唬鐧诲皝宀╃兢P-T-t...
绛旓細鐩墠锛PTt杞ㄨ抗涓殑t鍙槸琛ㄨ揪闅忔椂闂磋繘绋嬪博鐭充腑P锛孴鏉′欢鐨勫畾閲忓彉鍖栭斿緞锛屽苟鏈姹傛瘡涓樁娈P-T鐐圭殑鍏蜂綋骞撮緞鏁版嵁锛屼絾濡傝兘娴嬪緱PTt杞ㄨ抗涓婂悇闃舵P-T鐐圭殑鍦拌川骞撮緞锛屽垯鎵纭珛鐨凱Tt杞ㄨ抗鍏锋湁鏇村ぇ鐨勬剰涔夈傜洰鍓嶈В鍐宠繖涓闂鐨勪富瑕佷緷鎹槸涓嶅悓鐭跨墿涓笉鍚屾斁灏勬у悓浣嶇礌绯荤粺鐨勫皝闂俯搴︿笉鍚岋紝瀵硅繖浜涚熆鐗╂墍娴嬪緱鐨勫悓浣嶇礌骞撮緞...
绛旓細p-T-t杞ㄨ抗鏄犲北甯﹀舰鎴愯繃绋嬩腑娓╁害銆佸帇鍔涢殢鏃堕棿鍙樺寲鐨勫姩鎬佸弽鏄犮備笉鍚岀殑p-T-t杞ㄨ抗鍙嶆槧浜嗕笉鍚岀被鍨嬮犲北甯︾壒鐐瑰強鍏跺舰鎴愯繃绋嬬殑宸埆锛堥煩閮佽弫锛1993锛夈傚彉璐ㄥ博涓殑鐭跨墿缁勬垚涓庣粨鏋勬瀯閫狅紝鏄彉璐ㄥ彉褰㈣繃绋嬩腑鏋勯犲簲鍔涚姸鍐靛拰杩愬姩鏂瑰悜鐨勬樉绀猴紝閫氳繃瀵瑰彉璐ㄥ博涓畾鍚戠粍鏋勭殑鐮旂┒锛屽彲鎺㈢储閫犲北甯﹀姩鍔涘闂銆傚澶у埆灞卞強寮犲叓...
绛旓細涓銆佹磱澹虫垨闄嗗３淇啿甯︾殑楂 P/T 鍙樿川浣滅敤 娲嬪３淇啿甯︾殑鏋勯犵幆澧冪浉褰撲簬澶ф磱鍜屽ぇ闄嗘澘鍧楃殑鑱氬悎甯,鍓嶆湡浠ユ磱澹虫澘鍧楄緝蹇熶刊鍐插拰娑堝噺涓虹壒寰,鍚庢湡鍒欏繀椤荤户涔嬩互鍦颁綋鐨勮緝蹇熸姌杩斿拰鎶崌銆傝繖涓鍏ㄨ繃绋嬬殑鍙樿川浣滅敤 PTt杞ㄨ抗鍙互鎴戝浗澶у埆灞卞湴鍖虹殑钃濈墖宀╃浉楂樺帇甯︿负浠ｈ〃 ( 鍥 23 -6) 銆侻iyashiro ( 1961,1973)璁や负鐢变簬澶ф磱鏉垮潡...
