摘要:
对山东临朐红丝砚石进行全岩化学分析,发现红丝砚石的主量元素、微量元素、稀土元素等化学成分,并通过代表性元素比值来推测成因条件。结果显示,红丝砚石是CaO含量较高的碳酸盐岩,CaO含量为32.84%~53.10%,平均含量为47.69%。通过对红丝砚石主量元素的Mg/Ca、SiO2/(K2O+Na2O)、Al2O3/(K2O+Na2O)、Mn/Fe等比值,微量元素的Sr/Ba、Sr/Ca、Th/U等比值,稀土元素的LREE/HREE、[ω(La)/ω(Lu)]N、[ω(La)/ω(Yb)]N等比值以及δEu、δCe值和Yb/La—Yb/Ca图解推测矿床成因条件,得出红丝砚石为沉积成因的碳酸盐岩,属于滨海相、潮坪相浅水环境沉积。
Abstract:
Hongsi inkstone is popular because of its yellow and red colour and the filiform patterns.Hongsi inkstone was originally mined from Heishan in Qingzhou,Shandong Province,during the reign of Emperor Zhonghe years(881-884 A.D.)of Tang Dynastv.However,it was said that the stones exhausted at the end of Song Dynasty,and then were mined again from Qing Dynasty in the Laoyagu area in Linqu,Shandong Province。The Hongsi inkstone is not only good for ink-making,but also has fancy patterns and colour,which is extraordinary popular among the calligraphers and painters at all times and all over the world.
At present,researches on Hongsi inkstone are limited to the history,culture,identification and evaluation,etc,and less on petrochemistry and deposit genesis.
The geochemical compositions of the major elements,trace elements and rare earth elements of Hongsi inkstone samples from Linqu in Shandong Province were studied by whole-rock chemical analysis.The conditions for the genesis of Hongsi inkstones were speculated by the ratios of representative elements.The results show that Hongsi inkstones are the carbonatite with the high content of CaO.The content of SiO2 ranges from 3.38%to 7.87% with the average of 5.30%.The content of Al2O3 ranges from 0.75%to 1.74% with the average of 1.22%.The content of FeOT ranges from 0.65%to 1.43% with the average of 1.04%.The high content of CaO ranges from 32.84% to 53.10% with the average of 47.69%.The content of MgO ranges from 0.64% to 14.88% with the average of 3.92%. The high content of LOI ranges from 37.97% to 44.44%,with the average of 40.15%.The data above accord to the common chemical characteristics of the limestone.The ratios of Mg/Ca,SiO2/(K2O+Na2O),Al2O2/(K2O+Na2O)and Mn/Fe show the characteristics of the sedimentary carbonatite and the littoral facies sediment.
The contents of trace elements in Hongsi inkstone samples have significant change,the obviously higher contents of P,Ti,Mn,Sr,Ba and the slightly higher contents of Cr,Zn, Ni,which display the characteristics of the interactive marine-land shallow water environment in tidal-flat facies according to the ratios of Sr/Ba,Sr/Ca and Th/U.
The contents of rare earth elements range from 10.76×10-6 to 25.86×10-6 with the higher contents of La,Ce and Nd and the lower contents of Tm and Lu,which show the lower chemical contents than the compositions of continental crust.It displays the genesis characteristics of the sedimentary carbonate rocks by using the ratios of LREE/HREE, [ω(La)/ω(Lu)]N,[ω(La)/ω(Yb)]N of the rare earth elements and the values of δEu and δCe,and figure of Yb/La—Yb/Ca.
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