Apatite fission track thermochronology (AFTT) and paleomagnetic (PM) results have been used to constrain the Late Paleozoic to Cenozoic landscape evolution of the Lachlan Fold Belt (LFB) around the Northparkes copper‐gold deposit in east‐central New South Wales. The present‐day landscape of this region of the LFB is relatively flat with little expression of the underlying rock and has previously been interpreted to indicate long‐term stability of the region since the end of LFB orogenesis in the Early Carboniferous. This was presumably borne out by PM analyses from thick weathered horizons within open pits at the mine, which suggested that significant periods of weathering, and hence relative landscape stability, prevailed during the Early to middle Carboniferous and at some time during the Cenozoic. Results from AFTT analyses, however, indicate that the region must have experienced significant episodes of cooling/denudation during the mid‐Permian to mid‐Triassic and during the early Cenozoic, as well as episodes of heating/burial during the Late Carboniferous to mid‐Permian and during the late Mesozoic. When combined, the AFTT and PM results are in fact consistent and indicate that since the late Paleozoic the landscape of the LFB around the Northparkes deposit has evolved through multiple episodes of denudation and deposition as well as periods of relative stability during which the thick weathering horizons formed. Together these results establish a complementary chronological framework that constrains the Late Palaeozoic to Cenozoic landscape evolution of the Northparkes region and highlights the importance of using dual data sets in elucidating the long‐term landscape evolution of similar “stable” terranes.

中文翻译：

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澳大利亚拉克兰褶皱带 Northparkes 地区的长期景观演变：来自裂变径迹和古地磁数据的约束

磷灰石裂变径迹热年代学 (AFTT) 和古地磁 (PM) 结果已被用于限制新南威尔士州中东部 Northparkes 铜金矿床周围 Lachlan 褶皱带 (LFB) 的晚古生代到新生代景观演化。该 LFB 区域的现今地貌相对平坦，下伏岩石几乎没有表现，并且先前被解释为自早石炭世 LFB 造山作用结束以来该地区的长期稳定性。这可能是由矿场露天矿坑内厚厚风化层的 PM 分析所证实的，这表明在早至中石炭世和新生代的某个时间，显着的风化时期以及因此相对的景观稳定性盛行。然而，AFTT 分析的结果 表明该地区在中二叠世至中三叠世和早新生代期间必定经历了显着的冷却/剥蚀事件，以及在晚石炭世至中二叠世和晚中生代期间的加热/埋藏事件。结合起来，AFTT 和 PM 结果实际上是一致的，并表明自晚古生代以来，Northparkes 矿床周围的 LFB 地貌已经经历了多次剥蚀和沉积以及相对稳定的时期，在此期间厚风化层形成。