三星堆青铜器群的出现是什么原因造成的？
三星堆青铜器群高超的青铜器冶炼技术及青铜文化是如何产生的？[{'character': '三', 'pinyin': 'san1', 'highest pitch': 10.0, 'lowest pitch': 9.51, 'duration': 0.25, 'prosody hierarchy': 'null'}, {'character': '星', 'pinyin': 'xing1', 'highest pitch': 9.82, 'lowest pitch': 9.18, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '堆', 'pinyin': 'duei1', 'highest pitch': 10.17, 'lowest pitch': 9.05, 'duration': 0.2, 'prosody hierarchy': '#2'}, {'character': '青', 'pinyin': 'qing1', 'highest pitch': 10.81, 'lowest pitch': 9.05, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '铜', 'pinyin': 'tong2', 'highest pitch': 9.8, 'lowest pitch': 7.84, 'duration': 0.16, 'prosody hierarchy': 'null'}, {'character': '器', 'pinyin': 'qi4', 'highest pitch': 9.55, 'lowest pitch': 7.38, 'duration': 0.16, 'prosody hierarchy': 'null'}, {'character': '群', 'pinyin': 'qvn2', 'highest pitch': 7.93, 'lowest pitch': 5.88, 'duration': 0.33, 'prosody hierarchy': '#2'}, {'character': '高', 'pinyin': 'gao1', 'highest pitch': 8.7, 'lowest pitch': 8.32, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '超', 'pinyin': 'chao1', 'highest pitch': 8.85, 'lowest pitch': 7.97, 'duration': 0.24, 'prosody hierarchy': 'null'}, {'character': '的', 'pinyin': 'de5', 'highest pitch': 8.23, 'lowest pitch': 6.78, 'duration': 0.17, 'prosody hierarchy': '#2'}, {'character': '青', 'pinyin': 'qing1', 'highest pitch': 10.81, 'lowest pitch': 10.01, 'duration': 0.24, 'prosody hierarchy': 'null'}, {'character': '铜', 'pinyin': 'tong2', 'highest pitch': 9.8, 'lowest pitch': 7.1, 'duration': 0.16, 'prosody hierarchy': 'null'}, {'character': '器', 'pinyin': 'qi4', 'highest pitch': 9.55, 'lowest pitch': 7.38, 'duration': 0.17, 'prosody hierarchy': '#1'}, {'character': '冶', 'pinyin': 'ie3', 'highest pitch': 7.38, 'lowest pitch': 4.47, 'duration': 0.15, 'prosody hierarchy': 'null'}, {'character': '炼', 'pinyin': 'lian4', 'highest pitch': 9.94, 'lowest pitch': 4.57, 'duration': 0.21, 'prosody hierarchy': '#1'}, {'character': '技', 'pinyin': 'ji4', 'highest pitch': 8.06, 'lowest pitch': 6.38, 'duration': 0.17, 'prosody hierarchy': 'null'}, {'character': '术', 'pinyin': 'shu4', 'highest pitch': 7.01, 'lowest pitch': 5.78, 'duration': 0.25, 'prosody hierarchy': '#2'}, {'character': '及', 'pinyin': 'ji2', 'highest pitch': 7.11, 'lowest pitch': 5.83, 'duration': 0.19, 'prosody hierarchy': '#1'}, {'character': '青', 'pinyin': 'qing1', 'highest pitch': 10.81, 'lowest pitch': 9.76, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '铜', 'pinyin': 'tong2', 'highest pitch': 9.8, 'lowest pitch': 8.02, 'duration': 0.17, 'prosody hierarchy': '#1'}, {'character': '文', 'pinyin': 'uen2', 'highest pitch': 8.02, 'lowest pitch': 4.8, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '化', 'pinyin': 'hua4', 'highest pitch': 9.7, 'lowest pitch': 6.09, 'duration': 0.29, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.2}, {'character': '是', 'pinyin': 'shiii4', 'highest pitch': 7.35, 'lowest pitch': 5.88, 'duration': 0.23, 'prosody hierarchy': '#1'}, {'character': '如', 'pinyin': 'ru2', 'highest pitch': 9.83, 'lowest pitch': 5.85, 'duration': 0.15, 'prosody hierarchy': 'null'}, {'character': '何', 'pinyin': 'he2', 'highest pitch': 9.83, 'lowest pitch': 6.37, 'duration': 0.17, 'prosody hierarchy': '#1'}, {'character': '产', 'pinyin': 'chan3', 'highest pitch': 6.87, 'lowest pitch': 4.7, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '生', 'pinyin': 'sheng1', 'highest pitch': 6.22, 'lowest pitch': 4.73, 'duration': 0.24, 'prosody hierarchy': 'null'}, {'character': '的', 'pinyin': 'de5', 'highest pitch': 8.23, 'lowest pitch': 4.36, 'duration': 0.22, 'prosody hierarchy': '#4'}]